Moderna (also known as Spikevax) is a mRNA COVID-19 vaccine that is approved for people who are 18 and older. The initial series includes two doses given 28 days apart. Moderately or severely immunocompromised people should get an additional shot (third dose) at least 28 days after their second shot. A booster dose is recommended 5 months after completing the primary series.

Pfizer is a mRNA COVID-19 vaccine that is approved for people who are 5 to 11 years old. The initial series includes two doses given 21 days apart. Moderately or severely immunocompromised people should get an additional shot (third dose) at least 28 days after their second shot.

Pfizer (also known as COMIRNATY) is a mRNA COVID-19 vaccine that is approved for people who are 12 and older. The initial series includes two doses given 21 days apart. Moderately or severely immunocompromised people should get an additional shot (third dose) at least 28 days after their second shot. A booster dose is recommended 5 months after completing the primary series.

Janssen is a viral vector vaccine that is approved for people who are 18 years or older. People who receive the Janssen vaccine are eligible for a booster 2 months after their first shot. The CDC recommends an mRNA vaccine (Moderna or Pfizer) as a booster.