March 18, 2020, 2:40 PM PDT

@IanOGradyAZ @Paul_A_Healy They provide all numbers for public labs, but not negatives from commercial tests. It's like, close but no cigar. -@alexismadrigal

May 7, 2020, 2:02 PM PDT

While the increase was broad—10 states reported more than 10k tests—a few states reported unusually high numbers, suggesting they reported several days worth of negative tests today.

AZ, e.g., normally reports 3-4k tests. They reported 19k tests and fewer positives than normal.

May 8, 2020, 12:48 PM PDT

Arizona is the first U.S. state to begin reporting serology tests. We've been anticipating this, so on the backend we're prepared to record these numbers.

We will publish the data as soon as we can work out the particular kinks of how to do so.

https://t.co/34KNJncZvl https://t.co/VRHsQfpjSn

May 27, 2020, 3:23 PM PDT

Arizona, North Carolina, Minnesota, and Wisconsin are all seeing hospitalizations rising to new levels.

Not all states report this data, and we wish that they did. https://t.co/ql49O8FtuK

May 30, 2020, 3:02 PM PDT

In addition to the states we've mentioned recently, Alabama, Arizona, California, and Wisconsin are worth keeping eyes on.

California and Arizona had new highs for cases today. Alabama and Wisconsin set highs yesterday. https://t.co/M2JTnIfchI

June 4, 2020, 3:01 PM PDT

This is what a "patchwork pandemic" (as @edyong209 called it) looks like.

The regions vary, as do the states. While New York is seeing its best days since the very beginning, Arizona is seeing its worst. https://t.co/KJf0Mn9S18

June 5, 2020, 3:35 PM PDT

Arizona cases and hospitalizations continue to move upward. The positive test rate is also increasing.

The same is true in South Carolina, North Carolina, Arkansas, and Kentucky. https://t.co/7PcHgg1gvW

June 7, 2020, 3:35 PM PDT

Only 20k new cases were reported today. 24 states reported more than 300 new cases today.

New York and New Jersey tested more than 102k people combined, and only got ~1k positives.

On the other end of the spectrum, Arizona tested ~10k people and confirmed 1,438 new cases. https://t.co/q7b8gj50V2

June 9, 2020, 3:02 PM PDT

Arizona put out a somewhat encouraging set of numbers. Unclear if this is the beginning of a real downward trend or just some bumps on an upward trajectory. https://t.co/1Dcwe1qEra

June 10, 2020, 3:27 PM PDT

Arizona and South Carolina appear to have the most dire situations right now.

Most places in the northeast now have test positivity rates down under 3%. https://t.co/PBMxJBMubN

June 11, 2020, 2:55 PM PDT

We also just a number of new cases for Texas—1,826—in line with the state's recent growing numbers.

Arizona remains a trouble spot.

Alabama, which is experiencing an increase in cases, recently began reporting hospitalization. https://t.co/GtgfKkinE8

June 12, 2020, 3:05 PM PDT

States reported over 23k new cases today. That's within the range we've seen over the last month.

Here are the states that reported over 400 new cases. Arkansas, Arizona, and North Carolina reported new one-day highs. https://t.co/UeFFtjzdwB

June 12, 2020, 3:23 PM PDT

Here are four states—Texas, Arizona, North Carolina, and Arkansas—that had worrisome numbers today.

(Arizona's data dashboard crashed today, so we don't have a full set of their numbers. But we were able to capture these two metrics.) https://t.co/NDEfzp9cjn

June 13, 2020, 2:55 PM PDT

We are seeing new hospitalization highs in Texas, Arizona, and North Carolina. We're showing Louisiana here as well for context, since it had an early COVID-19 outbreak. https://t.co/BvbW8DYEyt

June 14, 2020, 2:55 PM PDT

Four states we've been watching closely—Texas, Arizona, North Carolina, and South Carolina—have not seen a leveling off yet in this new round of outbreaks. https://t.co/P0Ht5xsI7P

June 16, 2020, 3:16 PM PDT

Arizona reported 45% more cases today than on any previous single day. https://t.co/7kS4rM01l6

June 16, 2020, 3:20 PM PDT

Here are the five states with the greatest change in the number of people currently hospitalized.

A rising Arizona is about to cross a falling New York. https://t.co/ny80q6Ei5M

June 17, 2020, 3:15 PM PDT

The northeast has bottomed out, while the south and west are growing.

For the last two days, the state of Arizona alone has reported more new cases than the whole northeast. This was unimaginable even a few weeks ago. https://t.co/zkqM3oExGh

June 17, 2020, 3:21 PM PDT

Hospitalizations reflect the same trends. Arizona now has more people hospitalized than NY.

(Note: Florida might be on the right-hand list, but it does not provide this metric.) https://t.co/6iAzGanQ6J

June 18, 2020, 3:20 PM PDT

Here are 5 states we looked at closely today.

Cases and hospitalizations are tracking closely in TX, AZ, and the Carolinas, but not in California. California's positive rate also has not gone up. https://t.co/xqOUjRWpbo

June 20, 2020, 3:34 PM PDT

Since last Sunday, 20% of the reported tests in Arizona have come back positive.

Right next door in New Mexico, only 2.5% of tests are coming back positive. https://t.co/CnAuYgvpUD

June 23, 2020, 3:22 PM PDT

This map speaks for itself.

On a per-capita basis, the biggest increase occurred in Arizona. https://t.co/TNGDevgN3j

June 23, 2020, 3:32 PM PDT

Arizona reported a record number of cases and current hospitalizations today.

The signal is not entirely clear yet—and the absolute numbers are small—but deaths in the state have been generally rising since May 27. https://t.co/zfhgPcHW97

June 24, 2020, 4:02 PM PDT

Here's the continuing best news: deaths have not turned upward.

And the death numbers today and yesterday have been too high as they reflect Delaware (yesterday) and Arizona (today) rectifying undercounting of COVID-19 deaths from previous days. https://t.co/lvzuaLEs18

June 26, 2020, 3:32 PM PDT

This chart looks at per-capita testing rates and the percent positive. Arizona is all by itself, but South Carolina and Florida are moving rightward. https://t.co/H1Yl7VxzIA

June 27, 2020, 3:00 PM PDT

Here's a look at the weekly situation since April in Arizona, the state with the most intense outbreak right now. https://t.co/t1gIKzDHbZ

June 28, 2020, 4:33 PM PDT

Our apologies. The first Arizona chart we posted had a problem. The average deaths have risen, but not by as much as the chart showed. We've deleted the previous chart. This one is correct.

We regret the error. https://t.co/zeAoYcHrsO

June 29, 2020, 3:33 PM PDT

States reported ~36k new cases today. States typically report the fewest cases on Mondays (red in the chart) because of a weekend lag effect.

For example, Arizona reported 600 cases today after four straight days over 3000 cases. https://t.co/PUMWCzmlnI

June 29, 2020, 3:50 PM PDT

While we’re in the Monday lull in data reporting, let’s look at a couple of concerning states outside AZ-CA-FL-TX outbreaks.

Missouri’s percent positive rate has gone from 4.3% the week of June 14 to 6.5% this week, with hospitalizations rising. https://t.co/ahvI7Gdn7W

June 30, 2020, 3:30 PM PDT

Arizona, California, Florida, and Texas are still at the center of the current surge of new cases. Hospitalization for AZ, CA, and TX all climbing. We expect Florida's data has a similar shape. https://t.co/8G9RRQta6j

June 30, 2020, 3:42 PM PDT

Arizona’s update catches some reporting backlog — a common Tuesday data effect across many states. The 7-day average is often more useful to watch.

What's clear: The state’s surge has swamped local testing capacity. This week, almost a quarter of tests have come back positive. https://t.co/cdft4OzS4E

June 30, 2020, 4:06 PM PDT

A second optimistic point: New Mexico looks to be in good shape, despite the huge outbreaks in neighboring states Arizona and Texas. https://t.co/lZDFiyxIyN

July 1, 2020, 4:43 PM PDT

Several big states reported record numbers today: Arizona, California, Georgia, North Carolina, Texas. https://t.co/ZKTM496d2T

July 1, 2020, 4:53 PM PDT

In Arizona, cases and hospitalizations continue to spike. Over a quarter of all coronavirus tests now come back positive. Death data has been jumpy from day to day but the rolling average is rising, and the state reported a record number of deaths today. https://t.co/tUYR10XMu7

July 1, 2020, 5:05 PM PDT

In Arizona, cases and hospitalizations continue to spike. Over a quarter of all coronavirus tests now come back positive. Death data has been jumpy from day to day but the rolling average is rising, and the state reported a record number of deaths today. https://t.co/P41qAXnwf3

July 2, 2020, 2:48 PM PDT

Before we get to the daily numbers, here's our weekly look at the numbers.

One topline: While Arizona, California, Florida, and Texas are dominating the headlines, many other areas also have serious problems.

https://t.co/2eZOamhZla https://t.co/Qu70PjuDNO

July 2, 2020, 3:02 PM PDT

That said, the dynamics of COVID-19 deaths in this second surge remain complicated.

Deaths are not falling everywhere. In Arizona, for example, daily average deaths have tripled since June. https://t.co/8VQEnFCUKR

July 2, 2020, 3:13 PM PDT

It should be obvious now, but the large numbers of new cases in these states are not just due to testing. Florida and Georgia have positivity rates well beyond 10%.

Only Arizona has a higher positivity rate than Florida right now. https://t.co/ovxcUPtGpp

July 4, 2020, 3:36 PM PDT

Arizona, Florida, and South Carolina remain the three states with the most troubling data. https://t.co/X7SgEXu0vq

July 8, 2020, 4:44 PM PDT

There’s been a lot of discussions about deaths continuing to trend down as cases have surged. This chart provides a partial answer to what’s been happening. The falling numbers in the NE were offsetting rising deaths in AZ, TX, FL. https://t.co/hmZkhZXTPS

July 8, 2020, 4:48 PM PDT

This is the same pattern we saw for cases and hospitalizations over the last couple months. Compare Arizona, New Jersey, New York, and Texas. https://t.co/Uz6d2aQ9LU

July 8, 2020, 4:49 PM PDT

Sadly, cases are rising in many states beyond Florida, Texas, and Arizona. 23 states have seen their highest day of cases in the past 2 weeks. https://t.co/C5SC2UYLjg

July 8, 2020, 4:58 PM PDT

Although new cases continue to grow, testing providers are being overwhelmed. Turnaround times are lengthening; the supply chain is stressed. In a place like Arizona, this may mean that we won’t see rapid increases in cases because testing cannot scale with the outbreak. https://t.co/lTMW1VLGWe

July 9, 2020, 3:18 PM PDT

Standby for quick update to the Arizona data: extra digit slipped in to their total test number.

July 9, 2020, 3:58 PM PDT

Arizona is the poster child for this problem. Even as the outbreak continues there and hospitalizations and deaths rise, the 7-day average for tests has fallen in July. https://t.co/kYRQ2WgObb

July 10, 2020, 3:09 PM PDT

The upward trend holds for death data. Though the data is less smooth, between June 10 and July 10, the seven-day average of deaths reported by Arizona, California, Florida, South Carolina, and Texas has almost doubled. https://t.co/POzXF5GJG7

July 10, 2020, 3:26 PM PDT

At the peak in New York on April 15, that state hit 595 cases per million.

Arizona (580) and Louisiana (568) approached that number today. https://t.co/MxvPqIC43k

July 11, 2020, 3:24 PM PDT

While most attention has been focused on the big outbreaks across the southeast and in Arizona, there are several states outside the region that look to be on the verge of seeing much higher levels of transmission. https://t.co/sOI8fbPtoV

July 12, 2020, 3:23 PM PDT

Florida didn't just break the record for reported cases. It also shattered the mark for cases per million population. New York, at peak, hit 595. Today, Florida reported 712 cases per million. Arkansas also entered the 500+ tier, where we've only seen FL, AZ, and LA. https://t.co/KeQmHMA9as

July 13, 2020, 2:54 PM PDT

The weekend lag effect is pronounced in death reporting. For example, last week, CA reported 6 deaths on Monday, then 111 on Tues. AZ reported 1 death Mon, then 117 on Tues.

Today, AZ reported 8 deaths. CA, 23.

All these data are the outputs of complicated, human processes. https://t.co/WkN4aqCiGT

July 14, 2020, 3:13 PM PDT

Six states saw a rise of over 100 (FL, CA, TX, AZ, GA, TN) in their number of currently hospitalized COVID-19 patients. All six set new record highs for their states. https://t.co/1qvm9AEdMh

July 14, 2020, 3:26 PM PDT

Arizona’s data is muddled. Testing capacity is maxed, which affects the case count, as you can see by the similarity in the shape of those charts. But looking at other metrics, today the state reported record hospitalizations and its 2nd-highest number of deaths. https://t.co/b6DHtPoF0p

July 18, 2020, 3:49 PM PDT

Another place where the reported numbers are likely lower than the reality is AZ, which continues to have reporting problems, including some dashboard trouble that prevented us from compiling a complete update today.

https://t.co/OGTjaMHqLB

July 21, 2020, 3:06 PM PDT

Arizona's cases are declining, and although testing has also fallen, the state's current hospitalization numbers are also down, which is unequivocally good. Still: the state’s two highest death tolls are Saturday (147) and today (134). https://t.co/34vOeRtNKm

July 23, 2020, 3:48 PM PDT

We noted Arizona's falling case and completed test counts yesterday. It's worth recalling that on July 9, Governor Ducey said that his state would be doing 35k tests per day by the end of July.

7-Day Rolling Average:

Tests reported, 7/9: 13,175 Tests reported, 7/23: 10,492 https://t.co/7o5figd9Lf

July 29, 2020, 3:44 PM PDT

The hotspot states remain hotspots, even as their cases plateau a little or even decline. However, we’re now seeing more deaths reported in these states. Today, 773 deaths were reported by Arizona, California, Florida, and Texas alone. https://t.co/wv3NWzsJxk

July 30, 2020, 4:12 PM PDT

But there is good news to report as well. The 7-day new-case average is declining in all four of our major hotspot states: AZ, CA, FL, and TX. https://t.co/6c3MJLCLLl

September 1, 2020, 2:08 PM PDT

Arizona and Missouri report only facilities with outbreaks, not actual cases, deaths, or facility names—this appears transparent, but doesn’t convey COVID-19’s true impact. County health depts (Maricopa, AZ and St. Louis, MO) provide both states’ most reliable source of LTC data.

December 3, 2020, 4:54 PM PST

Zooming into the state level, more than 10 states broke case records today: AK, AR, AZ, DE, IN, MA, ME, NJ, PA, RI, and VT. Note: AZ had a higher count on Dec. 1, but it was a data backlog. https://t.co/ao6T6EQxiH

December 11, 2020, 4:33 PM PST

NV leads the nation in currently hospitalized patients per million people, followed by SD and AZ, which is close to its own summer peak. https://t.co/uD0hk69cJK

December 14, 2020, 4:42 PM PST

AZ and NV have the highest hospitalizations per million people in the country. Current hospitalizations in AZ have surpassed the state's peak in the summer. https://t.co/pGEhaciSJ9

December 16, 2020, 3:26 PM PST

Our numbers, while drastic, are an undercount of COVID-19’s severity in long-term-care facilities. Arizona, Missouri, and New York provide incomplete LTC data, and are the largest contributors to the nation’s LTC undercount. https://t.co/bOWkmNiKjg

December 16, 2020, 4:33 PM PST

The 7-day average for deaths is rising in 23 states across the US. There are 16 states reporting higher per-million deaths than the summer peak in AZ. https://t.co/hJgDH4deVF

December 18, 2020, 5:28 PM PST

NV and AZ currently have the highest hospitalizations per million people in the country. https://t.co/pkiYjesNc3

December 18, 2020, 5:35 PM PST

Per capita cases are growing at an alarming rate in AZ again. There are 1,049 new COVID-19 cases per million people in the state. In CA, the 7-day average for new cases per million people is quickly approaching 1,000. https://t.co/AqKmJOvMj6

January 7, 2021, 5:32 PM PST

But some small states have severe problems, too. Alabama, Arizona, and Nevada have very high hospitalization rates per capita. https://t.co/Sz9H82Boz8

January 8, 2021, 5:03 PM PST

Hospitalizations in CA and AZ are increasing at an alarming rate. AZ has far surpassed their summer surge. https://t.co/vpqxOx3HDU

January 14, 2021, 4:29 PM PST

Our eyes are on 5 states this week: AL, AZ, CA, GA, and FL―where surges in cases, hospitalizations, and deaths are steadily growing. Alarmingly, AZ currently has the worst per-capita new case numbers in the world.

January 21, 2021, 3:31 PM PST

Correction: Earlier today, we tweeted that Indigenous people in AZ are 3x more likely to have been hospitalized with COVID-19 than their white neighbors. The correct number is 2.4x. We apologize for the error. https://t.co/FclsH9NJeo

February 5, 2021, 4:54 PM PST

Only New York and Arizona have more than 400 people hospitalized with COVID-19 per million residents. A month ago, 19 states exceeded that level. https://t.co/6IPpFnUiMH