Comirnaty and Pfizer-BioNTech COVID-19 VaccineOn August 23, 2021, FDA announced the first approval of a COVID-19 vaccine. The vaccine has been known as the Pfizer-BioNTech COVID-19 Vaccine, and will now be marketed as Comirnaty, for the prevention of COVID-19 in individuals 16 years of age and older. Pfizer-BioNTech COVID-19 Vaccine is authorized for emergency use and is available under the EUA as a two-dose primary series for individuals 5 years of age and older, as a third primary series dose for individuals 5 years of age and older who have been determined to have certain kinds of immunocompromise, and as a single booster dose for individuals 12 years of age and older at least five months after completing a primary series of the vaccine. The Pfizer-BioNTech COVID-19 Vaccine is also authorized for use as a heterologous (or “mix and match”) single booster dose for individuals 18 years of age and older following completion of primary vaccination with a different available COVID-19 vaccine. For example, Moderna and Janssen COVID-19 vaccine recipients 18 years of age and older may receive a single booster dose of the Pfizer-BioNTech COVID-19 Vaccine. On November 17, 2021, CDC, in consultation with FDA, issued emergency use instructions to provide information about the use of the vaccine as an additional primary series dose or as a booster dose in certain individuals who completed vaccination with certain non-FDA-authorized or -approved COVID-19 vaccines.