Reporting COVID-19 Vaccinations in the United States

Total Doses Distributed

The total number of vaccine doses that have been distributed to vaccine provider locations.

For states, Washington DC, the U.S. Virgin Islands, and Puerto Rico, total counts of COVID-19 vaccine doses include doses distributed since December 14, 2020.

For the Republic of Palau, the Federated States of Micronesia, the Republic of the Marshall Islands, Guam, American Samoa, and the Commonwealth of the Northern Marianas Islands, total counts of COVID-19 vaccine doses include doses marked as shipped since December 13, 2020.

Total Doses Administered

The total number of vaccine doses that have been given to people in the United States since December 14, 2020. This is the date when the first dose was administered to a person in the United States under the Emergency Use Authorization not within a clinical trial.

People Receiving at Least One Dose

Represents the total number of people who received at least one dose of COVID-19 vaccine approved or authorized for use in the United States. This metric includes everyone who has received only one dose and those who received more than one dose.

People Who Are Fully Vaccinated

Represents the total number of people who have received the second dose in a two-dose COVID-19 vaccine primary series or one dose of a single-dose COVID-19 vaccine primary series approved or authorized for use in the United States.

• The number of people fully vaccinated with Johnson & Johnson's Janssen (J&J/Janssen) vaccine does not equal the total number of J&J/Janssen vaccine doses administered because some people were reported to have received one or more mRNA vaccines (i.e., Pfizer-BioNTech, Moderna) prior to receiving the single-dose J&J/ Janssen vaccine.

• For reporting on CDC COVID Data Tracker, CDC counts people as being "fully vaccinated" if they received one dose of a single-dose vaccine or two doses on different days (regardless of time interval) of either an mRNA or a protein-based series.

People Who Are Eligible to Receive a First Booster Dose

Represents the total number of fully vaccinated people who are eligible to receive a first booster dose of an mRNA COVID-19 vaccine if it has been at least 5 months since their completed Pfizer-BioNTech or Moderna primary series or at least 2 months since their completed J&J/Janssen single-dose vaccine. Completion of a primary series does not distinguish if the recipient is immunocompromised and received an additional dose. This measure excludes recipients who received an "Other" primary series vaccine type.

People Who Received a First Booster Dose

Represents the total number of fully vaccinated people who later received another dose of any COVID-19 vaccine on or after August 13, 2021. This measure does not consider how much time has passed since the recipient was vaccinated or whether the vaccine recipient is immunocompromised, has an underlying medical condition, or is at high-risk from occupational and institutional exposure to COVID-19. People who are fully vaccinated are those who received the second dose in a two-dose COVID-19 vaccine primary series or one dose of a single-dose COVID-19 vaccine primary series.

Learn more about CDC's recommendations for a COVID-19 vaccine booster dose.

On September 30, 2021, this language was changed to reflect the recommendation for a booster dose. People who received an additional dose since August 13, 2021, are included in this count.

People Who Received a Second Booster Dose

Represents the total number of fully vaccinated people who received two subsequent doses of COVID-19 vaccine beginning August 13, 2021, which includes people who received two booster doses and moderately or severely immunocompromised people who received one additional dose and one booster dose. This measure does not consider eligibility based on age, whether the vaccine recipient is immunocompromised, or how much time has passed since first booster dose. People who are fully vaccinated are those who received the second dose in a two-dose COVID-19 vaccine primary series or one dose of a single-dose COVID-19 vaccine primary series.

Learn more about CDC's recommendations for a COVID-19 vaccine booster dose.

Rates per 100,000

Represent the rate of total doses distributed, the rate of total doses administered, the rate of people receiving at least one dose, the rate of people who are fully vaccinated, and the rate of people receiving a booster dose per 100,000. The rate per 100,000 people is calculated for the total population and select demographic groups (such as people ages 65 years or older) using population data. This allows comparison between areas with different population sizes.

Percent of the Population

Represents the percent of people receiving at least one dose, the percent of people who are fully vaccinated, and the percent of fully vaccinated people who have received a first booster dose. The percent of people who have received at least one dose and the percent of people who are fully vaccinated are calculated for the total population and select demographic groups (such as people ages 65 years or older) using population data.

7-Day Moving Average

This metric is calculated by summing a vaccination metric (such as people receiving dose one) for the most recent 7 days and dividing by 7.

County of Residence

CDC determines county of residence by matching the county Federal Information Processing Standard State (FIPS) code to the state as submitted in the raw data provided to CDC.

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