Three COVID-19 vaccines — produced by Pfizer-BioNTech, and, Moderna, and Johnson and Johnson — have been authorized by the FDA and are being delivered to the U.S. population. The vaccine produced by Pfizer-BioNTech has a reported efficacy of 95%, the vaccine produced by Moderna has a reported efficacy of 94%, and the vaccine reported by Johnson and Johnson has a reported efficacy of 66%. The Pfizer-BioNTech and Moderna vaccines are two-dose vaccines, while the Johnson and Johnson vaccine is single-dose.
As of 3 March 2021, 26,957,804 people have received two doses of a COVID-19 vaccine, and more than 4M doses per week of the Pfizer and Moderna vaccine are being delivered to the US according to vaccine distribution reports maintained by the Centers for Disease Control and Prevention.
Public health officials can use forecasts of the number of people expected to receive one or more doses of a COVID-19 vaccine to (i) better predict incident cases and deaths and (ii) communicate the potential risks of infection to the public.
Data sources and more information:
What will be the cumulative number of people who receive two doses of a COVID-19 vaccine in the US on 2021-03-31?
This question will resolve as the cumulative number of people who receive 2 doses of a COVID-19 vaccine on 2021-03-31 as recorded by the Centers for Disease Control COVID-19 Data tracker. The radio buttons “People Receiving 2 Doses” and “Cumulative” will be selected and the bar corresponding to 2021-03-31 will be accessed. Data is updated daily by 8pm ET and will be accessed no sooner than 2021-04-04. If the CDC changes how it reports vaccination data, we will provide clarifying language as necessary. For purposes of this question, a person receiving a single-dose vaccine would count as a person having received one or more doses of a COVID-19 vaccine.
8 March edit: on 8 March the CDC's vaccine tracker at https://covid.cdc.gov/covid-data-tracker/#vac… changed the “receiving 2 doses” figure to "fully vaccinated” to account for people who receive one dose of the Johnson & Johnson vaccine, which has been authorized as a single-dose regimen (by contrast, Pfizer/BioNTech and Moderna are authorized as two-dose vaccines). This question will resolve on the basis of the new "fully vaccinated" figure reported by the CDC.