Types of Vaccines
There are 4 vaccines available in the United States: Pfizer-BioNTech, Moderna, Johnson & Johnson’s Janssen, and Novavax. Your vaccine may require more than one dose during your primary series, which is your first time being vaccinated.
- Pfizer-BioNTech: 2 doses given 3 weeks (21 days) apart
- Moderna: 2 doses given 4 weeks (28 days) apart
- Johnson & Johnson’s Janssen: 1 dose
- Novavax: 2 doses given 3 weeks (21 days) apart
All are safe, tested, and effective at reducing your risk of severe illness. Learn more about COVID-19 vaccines.
People who are moderately to severely immunocompromised may be eligible for an additional dose. This additional dose is administered during the primary series. Eligible people include individuals undergoing cancer treatment or people with HIV/AIDS. See vaccine recommendations for immunocompromised people.
Anyone age 5 or older is eligible for a booster dose. Reformulated bivalent boosters that bolster protection against the dominant omicron strains of the virus have been widely available since September 2022. Adults may “mix and match” the booster shot, which means get a booster dose with a vaccine that is different from the one received during the primary series. The Pfizer-BioNTech bivalent boosters are approved for children 5 and older. The updated Moderna booster is approved for children 6 and older.
You are up to date with your COVID-19 vaccines if you have completed a COVID-19 vaccine primary series and received the bivalent booster dose recommended for you by CDC. To determine when you should receive your next booster dose, see booster shot recommendations.
Vaccines for Children
Children ages 5 through 11 receive an age-appropriate dose that is one-third of the adult dose. See vaccine recommendations for children and teenagers.