As of early March, three COVID-19 vaccines received emergency use authorization (EUAs) from the FDA. In
December, the Pfizer/BioNTech COVID-19 vaccine and the Moderna COVID-19 vaccine received EUAs, and in late
February the Johnson & Johnson/Janssen COVID-19 vaccine received an EUA. Both the Pfizer/BioNTech and Moderna vaccines require two separate doses, while the Johnson & Johnson/Janssen vaccine requires only a single dose. EUAs are not an FDA approval; EUAs are authorizations for non-FDA-approved drugs when no other effective alternatives are available, and the benefits appear to outweigh the risk.
