A “booster dose” is another dose of a vaccine that is given to someone who built enough protection after vaccination, but then that protection decreased over time (this is called waning immunity). The Centers for Disease Control and Prevention has recommended booster doses of Pfizer vaccine booster dose to people 18 years and older who completed the Pfizer COVID-19 vaccine as their primary series, and it has been AT LEAST six months since receiving the second dose.
The CDC recommends the booster for the following eligible individuals:
- Persons age 65 and older and long-term care facility residents
- Persons age 50 to 64 years with underlying medical conditions
- Persons based on individual benefit and risk who are age 18 to 49 years with underlying medical conditions
- Persons 18-64 at increased risk of exposure and transmission due to occupational or institutional settings
Only the Pfizer vaccine is authorized by the Food and Drug Administration for a booster dose.