Additional vaccine doses (booster shots and third doses)

Content verified January 13, 2022

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Eligible people

Effective Thursday, January 6, 2022, anyone 12 years and older may get a booster.

If you are 18 years and older, you may choose any of the available COVID-19 vaccines as your booster. If you want a specific vaccine as your booster, check that your vaccination site has it available.

12 to 17-year-olds must select Pfizer boosters.

Booster Shot Eligibility
If you got You can get a booster If you are
Pfizer 5 months after second dose 12 years and older
Moderna 5 months after second dose 18 years and older
Johnson & Johnson 2 months after single dose
Additional Dose recommendations
Detailed CDC COVID-19 vaccine guidance for immunocompromised people
If you got An additional dose is recommended If you are
Pfizer At least 28 days after your second dose Immunocompromised and 12 years and older
Moderna At least 28 days after your second dose Immunocompromised and 18 years and older
Johnson & Johnson Booster recommended 2 months after single dose
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Available locations

Use Maryland’s vaccine locator
See County-run clinics | Make appointments

Your healthcare provider may have vaccine, too.

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Items to bring to your appointment

Bring these items to your additional dose appointment

You will be required to self-certify underlying medical conditions and age.

You do not need a doctor's note or medical history.


Are there risks of receiving an additional vaccine dose?

Limited information exists about the risks of receiving an additional dose of vaccine. Ongoing research is looking at the safety and benefit of additional doses of COVID-19 vaccines.

So far, reactions reported after a third dose of an mRNA vaccine were similar to those for first and second doses. The most common side effects reported have been fatigue and pain at the injection site. Overall, most side effects have been mild to moderate.