COVID-19 Vaccinations in the United States Data Definitions

Total Doses Delivered; Total Count

The total number of vaccine doses that have been delivered to the following locations

  • jurisdiction (state, territory, tribe, or local entity) partner clinics,
  • retail pharmacies,
  • long-term care facilities,
  • dialysis centers participating in the Federal Dialysis Center Program,
  • Federal Emergency Management Agency (FEMA) partner sites,
  • Health Resources and Services Administration (HRSA) partner sites, and federal entity facilities (e.g., Department of Defense, Veterans Health Administration, Indian Health Service, and Bureau of Prisons) in that jurisdiction.

For states, Washington DC, the US Virgin Islands, and Puerto Rico, total counts of COVID-19 vaccine doses include doses delivered 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 in VTrckS since December 13, 2020.

Doses Delivered; Rate per 100,000

The total number of vaccine doses delivered for every 100,000 people (overall, per the population ages 5 years and older, per the population ages 12 years and older, per the population ages 18 years and older, and per the population ages 65 years and older) is calculated. This allows comparison between areas with different population sizes.

Total Doses Administered; Total Count

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. Doses administered in a jurisdiction (state, territory, tribe, or local entity) include those administered in:

  • jurisdictional (state, territory, tribe, or local entity) partner clinics,
  • retail pharmacies,
  • long-term care facilities,
  • dialysis centers participating in the Federal Dialysis Center Program,
  • Federal Emergency Management Agency (FEMA) partner sites,
  • Health Resources and Services Administration (HRSA) partner sites, and
  • federal entity facilities (e.g., Department of Defense, Veterans Health Administration, Indian Health Service, and Bureau of Prisons) in that jurisdiction.

Total Doses Administered; Rate per 100,000

The total number of vaccine doses given for every 100,000 people (overall, per the population ages 5 years and older, per the population ages 12 years and older, per the population ages 18 years and older, and per the population ages 65 years and older). This allows comparison between areas with different population sizes.

People Receiving at Least One Dose; Total Count*

(Formerly “Receiving 1 or More Doses”)

Represents the total number of people who received at least one dose of COVID-19 vaccine, including those who received one dose of the single-shot J&J/Janssen COVID-19 vaccine.

  • This metric includes everyone who has received only one dose and those who received more than one dose.
  • For this measure, CDC’s COVID Data Tracker attributes each dose to the jurisdiction (state, territory, tribe, or local entity) in which the person resides.

People Receiving at Least One Dose; Percent (%) of the Population*

Represents the percent of people who received at least one dose of COVID-19 vaccine, including those who received one dose of the single-shot J&J/Janssen COVID-19 vaccine. This metric includes everyone who has received only one dose and those who received more than one dose.

  • For this measure, CDC’s COVID Data Tracker attributes each dose to the jurisdiction (state, territory, tribe, or local entity) in which the person resides. This includes doses administered by FEMA partner sites, HRSA partner sites, and federal entity facilities.
  • Estimates for the total population, population of those ages 5 years and older, population of those ages 12 years and older, population of those ages 18 years and older, and population of those ages 65 years and older are used as the denominators to calculate these percentages.

People Who Are Fully Vaccinated; Total Count*

(Formerly “Receiving 2 Doses”)

Represents the number of people who have received the second dose in a two-dose COVID-19 vaccine series or one dose of the single-shot J&J/Janssen COVID-19 vaccine.

  • For this measure, CDC’s COVID Data Tracker attributes each dose to the jurisdiction (state, territory, tribe, or local entity) in which the person resides.

People Who are Fully Vaccinated; Percent (%) of the Population*

Represents the percent of people who have received the second dose in a two-dose COVID-19 vaccine series or one dose of the single-shot J&J/Janssen COVID-19 vaccine.

  • For this measure, CDC’s COVID Data Tracker attributes each dose to the jurisdiction (state, territory, tribe, or local entity) in which the person resides. This includes doses administered by FEMA partner sites, HRSA partner sites, and federal entity facilities.
  • Estimates for the total population, population of those ages 5 years and older, population of those ages 12 years and older, population of those ages 18 years and older, and population of those ages 65 years and older are used as the denominators to calculate these percentages.
  • This definition differs from the current CDC Interim Clinical Considerations in two ways:
    1.  According to the interim guidance, the second dose of Pfizer-BioNTech and Moderna vaccines should be administered as close to the recommended interval as possible, but not earlier than recommended (i.e., 3 weeks for Pfizer-BioNTech or 4 weeks for Moderna). However, second doses administered within a grace period of 4 days earlier than the recommended date for the second dose are still considered valid. If it is not feasible to adhere to the recommended interval and a delay in vaccination is unavoidable, the second dose of Pfizer-BioNTech and Moderna COVID-19 vaccines may be administered up to 6 weeks (42 days) after the first dose. Currently, only limited data are available on efficacy of mRNA COVID-19 vaccines administered beyond this window.
    2. To ensure adequate time for an immune response to occur, a person is considered fully vaccinated 2 weeks after completion of a two-dose mRNA series or one dose of Janssen vaccine.

People Who Received a 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 series or one dose of the J&J/Janssen COVID-19 vaccine.

Learn more about CDC’s recommendations for COVID-19 vaccine booster doses.

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

Rates per 100,000

Represent the rate of total doses delivered, the rate of total doses administered, the rate of people receiving at least one dose, and the rate of people who are fully vaccinated per 100,000. The total population, population of those ages 5 years and older, population of those ages 18 years and older, and population of those ages 65 years and older are used as estimates to calculate rates for total doses delivered and total doses administered. In some limited circumstances, people might receive vaccinations outside the jurisdiction (state, territory, tribe, or local entity) where they live. These rates currently account for vaccinations that occur in the jurisdiction where the vaccination was administered.

Percent of the Population

Represents the percent of people receiving at least one dose and the percent of people who are fully vaccinated. The total population, population of those ages 5 years and older, population of those ages 18 years and older, and population of those ages 65 years and older are used as denominators to calculate the percent of the total population, the percent of the population ages 5 years and older, the percent of the population ages 18 years and older, and the percent of the population ages 65 years and older who have received at least 1 dose or who are fully vaccinated. The percent of the total population was derived using the location of residence.

CDC has capped estimates of vaccination coverage shown on COVID Data Tracker at 95%. This cap helps address potential overestimates of vaccination coverage due to first, second, and booster doses that were not linked. Other reasons for overestimates include census denominator data not including part-time residents or potential data reporting errors. Previously, CDC had capped estimates of vaccination coverage at 99.9%. CDC changed the cap to 95% on December 9, 2021 to account for differences in the accuracy of vaccination coverage estimates between different jurisdictions.

*CDC determines the number of people receiving at least one dose and the number of people who are fully vaccinated based on information that state, territorial, tribal, and local public health agencies and federal entities reported to CDC on dose number, dose manufacturer, administration date, recipient ID, and date of submission. Because the method used to determine dose numbers needs to be applied across multiple jurisdictions (states, territories, tribes, or local entities) with different reporting practices, CDC’s dose number estimates might differ from those reported by jurisdictions and federal entities. People receiving doses are attributed to the jurisdiction in which the person resides. When the vaccine manufacturer is not reported, the recipient is considered fully vaccinated with two doses.

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