Massachusetts

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On December 25, 2020, Massachusetts announced on their COVID-19 page that there would be no update to their data on December 25, 2020, or on January 1, 2021. Additionally, they noted that data reported on December 26, 2020 and January 2, 2021 would each include two days of data.

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Confirmed cases from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 26, 2020, Massachusetts announced on their COVID-19 Response Reporting page that there would be no update to their data on November 26, 2020 due to the the Thanksgiving holiday. Additionally, they announced that the data for November 27, 2020 would include both the data for November 26, 2020 and November 27, 2020.

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On November 25, 2020, Massachusetts reported that their data “was delayed today due to a technological issue that resulted in an interruption of the data download. As a result, today’s numbers reflect case counts from up to a 30 hour period" instead of the usual previous 24-hour period.

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of November 2, 2020, Massachusetts’ Currently Hospitalized, Currently in ICU, and Currently on Ventilator figures include only confirmed cases. Previously these numbers included confirmed and probable hospitalizations.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

As of September 11, 2020, Massachusetts’ total test results reflect total specimens. The number of unique people tested is available in our API as totalTestsPeopleViral.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a significant decrease in several data points where probable cases or probable deaths were included, particularly the overall case count, which dropped by more than 7,000. Historical data was also affected.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

On September 2, 2020, MA reported that it had shifted to using the more restrictive August 6 definition of probable cases released by the CSTE. This change caused a decrease in several data points where probable cases or probable deaths were included, particularly the overall case count and total deaths. Historical data was also affected.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

On August 31, 2020 we updated Massachusetts' Total PCR Tests (specimens) before August 12, 2020 based on the state's "Tests by Date" dataset, extending the column back to January 22, 2020.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

On June 1, 2020, Massachusetts began to report probable cases and *probable deaths, causing Total cases and Total deaths to appear to increase sharply in our data.

On June 30, 2020, Massachusetts decreased the number of cumulative hospitalizations and confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, 2020, Massachusetts noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill case data for Massachusetts in the near future.

On August 12, 2020, Massachusetts began reporting probable cases weekly instead of daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, 2020, we will use the daily total case count from the race and ethnicity section of the dashboard, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

Negative test results reported in our API and CSVs are calculated by subtracting Positive PCR tests (people) from Total PCR tests (people).

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested.

On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data.

On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, MA noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill our own case counts for MA as soon as possible.

On August 5, MA did not publish data by our collection time. A note on their site said "Significant IT issues are impacting the production of today's data report. It will be posted as soon as it is available."

On August 12, MA began reporting probable cases weekly, not daily. This can lead to apparent spikes in the data when the weekly numbers are incorporated, as happened on August 19. Beginning August 20, we will use MA's daily total case counts for its race and ethnicity data, which includes both confirmed and probable cases, and will backfill the previous week's case counts.

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested.

On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data.

On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, MA noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill our own case counts for MA as soon as possible.

On August 5, MA did not publish data by our collection time. A note on their site said "Significant IT issues are impacting the production of today's data report. It will be posted as soon as it is available."

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested.

On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data.

On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

On July 31, MA noted that "Delays in the reporting of test results to DPH from multiple laboratories, including large national commercial laboratories, are reflected in today’s case counts. However, these positive test results have been assigned retrospectively to the appropriate date of test." We will backfill our own case counts for MA as soon as possible.

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested.

On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data.

On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested. On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested. On June 1, MA began to release probable cases and deaths, causing total cases and total deaths to spike in our data. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

MA reports both the number of tests performed and the number of people tested. Both data points are available in our API, but MA data on our web pages is reported in units of people tested As of April 20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

As of April 20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. As of April 20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases. On June 30, MA decreased the number of cumulative hospitalization, confirmed and probable deaths "due to ongoing data cleaning which identifies and removes duplicate reports."

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. As of April 20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. As of 4/20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. As of 4/20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. As of 4/20, Cumulative Hospitalized + ICU includes both confirmed and suspected cases.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change. For 4/20, Cumulative Hospitalized, Cumulative in ICU includes both confirmed and suspected cases.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change.

Positives include results from the CDC. Total tested includes repeat testing on individuals. State lab numbers are as of 8 am, other lab numbers are as of 11:30 am. Commercial lab numbers are subject to change.

Positives include 8 CDC tests as noted in the PDF. Negatives calculated from the PDF. Updates at 4pm.

Positives include 8 CDC tests as noted in the PDF. Negatives calculated from the PDF. Updates at 4pm.

There is a discrepancy between PDF on site and table on site. We backed out negatives from the PDF and used the (higher) positive number on the page.

Reports all negatives as of 3/16. Some doublecounting in total tests, interpreting as "total people tested".

Comprehensively reported negatives on 3/16, as captured by Jordan Zino.

Data is in a table under “COVID-19 cases in Massachusetts”. Only positives reported. Negatives inferred from 3/13 Boston Globe report.

Data is in a table under the “COVID-19 cases in Massachusetts” header. Only positives are regularly reported. Negative count inferred from 3/13 data released to Boston Globe.

Data is in a table under the “COVID-19 cases in Massachusetts” header. Only positives are being reported.