Vaccine data reporting 101:

The CDC pulls numbers from state immunization sites every morning at 6 a.m. (the daily cutoff). It spends the morning verifying these numbers and publishes a public update by 8 p.m. (usually some time in the afternoon).
Today, the CDC reported 2,977,732 doses by the 6 a.m. cutoff (a record regardless) and then had a delay in data syncing, resulting in 4,575,496 new doses administered that were reported. This means tomorrow's numbers will be slightly lower than usual.
As per usual, doses are reported two ways: by the day they are reported (right) and the day they are actually administered (left). The graph on the left is backfilled each day as states report more doses. However, we often use the graph on the right for daily vaccinations.
Could this increase be a result of state backlogs? Sure, it's possible, especially in large states. However, they only play quite a small role in today's large number.

Key points, regardless of this anomaly:
- Today was a huge day for vaccinations
- 7-day average is increasing
Thank you to @cyrusshahpar46 and the data scientists at the CDC for keeping us updated.

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More from @bhrenton

13 Mar
Earlier this week, Alaska made vaccines available to those 16 and older, becoming the first state to remove eligibility requirements. It leads the nation with 17% of its population fully vaccinated. So what can we learn? And what is it sometimes hard to compare states? A thread:
While Alaska is the first state to remove eligibility requirements, effective immediately, other states are expected to do the same in the coming weeks, and certainly before President Biden's deadline on May 1. We will continue to track these.
washingtonpost.com/health/2021/03…
Vaccination plans are complex and in order to make comparisons among states with metrics such as doses per capita and percentage of the population vaccinated, we must consider:
- Supply
- Delivery
- Uptake
- Population characteristics

Let's analyze Alaska with these factors.
Read 13 tweets
10 Mar
2,028,692 doses have been reported administered in the last 24 hours, according to the CDC. 24.4% of adults have received a first dose.

Doses Delivered: 127,869,155
Doses Administered: 95,721,290

74.9% of delivered doses have been administered.
public.tableau.com/views/COVID-19… Image
North Dakota leads the nation with 87.3% of shots used. The percentage of supply used is merely one metric to compare states, and soon the dashboard will have more metrics for you to use. The 7-day average is now 2.17 million doses per day. Image
15.7 million doses of Pfizer and Moderna doses have been allocated for jurisdictions next week. The dashboard has been updated with the latest allocations.
Read 4 tweets
10 Mar
It's important to note that each state has different population characteristics that could affect the speed of its vaccination rollout. For example 7.5% of residents in Alaska are over the age of 70, compared to 13.4% in Vermont. State governments often know what is best.
This is not necessarily endorsing a particular state's strategy. Rather, it is stating the fact that states are allocated doses based on its general adult population, not according to each state's individual strategy. States using an aged-based system may take…
…longer to move through age bands, particularly if the average age is older than other states. Additionally, vaccine uptake plays a huge role — some states have ensured high uptake in each group before moving on to the next one.
Read 4 tweets
20 Feb
1,847,276 doses have been reported administered in the last 24 hours, according to the CDC. All states reported doses delivered and administered.

Doses Delivered: 78,152,495
Doses Administered: 59,585,043

76.2% of delivered doses have been administered.
public.tableau.com/views/COVID-19…
Will post more data in the coming days detailing how severe weather is affecting vaccine deliveries, as the White House announced today 6 million doses are backlogged and will be shipped very shortly. Deliveries and reporting systems are recovering — look at the green uptick.
North Dakota now leads the nation with 95% of shots used. This number will drop for all states as supply is replenished.
Read 4 tweets
19 Feb
Just over 21,000 vaccine doses were reported administered in Texas in the last 24 hours, the latest in a series of fallbacks after severe weather has disrupted vaccination sites and reporting systems. The number of doses allocated to the state has not changed in 3 days. Image
In the last 24 hours, 46% of counties reported fewer than 10 doses administered. Compared with last Thursday, almost all counties are reporting fewer new doses administered by a large margin. It may take days for the infrastructure to recover and reporting to catch up. Image
"Any delays, the timing could not be worse," @PeterHotez said on @CNNTonight last night.
Read 4 tweets
18 Feb
1,455,940 doses have been reported administered in the last 24 hours, according to the CDC. Rebound is slow from the weekend due to supply issues.

Doses Delivered: 73,377,450
Doses Administered: 57,737,767

77.7% of delivered doses have been administered.
public.tableau.com/views/COVID-19… Image
New Mexico leads the nation with 100.4% of delivered doses administered — this is most likely due to the counting of the sixth dose in Pfizer vials. The 7-day average is 1.62 million doses/day. Image
Many states did not report deliveries of doses due to severe weather.
Read 4 tweets

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