COVID-19 vaccine third doses and boosters
Third doses for the immunocompromised
The U.S. Food and Drug Administration (FDA) has allowed a third dose of the Pfizer and Moderna vaccines to be given to those who are immunocompromised (have weakened immune systems that are moderate to severe).
See common questions about the third dose shots.
Booster doses of the Pfizer vaccine
The FDA has approved a booster dose of the Pfizer vaccine for certain individuals. A booster shot is for those whose immunity may wane over time or who may need protection against a new virus strain. A COVID-19 booster shot is given at least six months after completing the “primary series” (two doses) of the Pfizer vaccine. Booster shots are given to those age 18+ who are eligible.