Additional vaccine doses (booster shots and third doses)

Content verified May 20, 2022

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Eligible people

Effective May 20, 2022, our County-run clinics provide COVID-19 booster shots to children ages 5 to 11 as recommended by the FDA and CDC.

mRNA vaccine (Pfizer or Moderna) booster dose is preferred for people ages 18 years and older, but you may consider J&J/Janssen COVID-19 vaccine in some situations.

First Booster Shot Eligibility
If you are Your vaccine was You can get a first booster with booster vaccine
5 to 17 years Pfizer 5 months after second dose Pfizer
18 years and older Pfizer 5 months after second dose J&J, Moderna, or Pfizer
Moderna 5 months after second dose J&J, Moderna, or Pfizer
Johnson & Johnson 2 months after single dose J&J, Moderna, or Pfizer
Second Booster Shot Eligibility
If you are With first booster You can get a second booster With booster vaccine
18 years and older J&J (where primary shot was also J&J) 4 months after first booster Moderna or Pfizer
50 years and older J&J, Moderna, or Pfizer 4 months after first booster Moderna or Pfizer
Immunocompromised and 12 to 17 years Pfizer 4 months after first booster Pfizer
Immunocompromised and 18 years and older J&J, Moderna, or Pfizer 4 months after first booster Moderna or Pfizer
Additional Dose recommendations
If you are Your vaccine was An additional dose of Moderna or Pfizer is recommended You can get a Moderna or Pfizer booster
Immunocompromised and 5 to 17 years Pfizer At least 28 days after your second dose Pfizer only, at least 3 months after third dose
Immunocompromised and 18 years and older Pfizer At least 28 days after your second dose at least 3 months after third dose
Moderna At least 28 days after your second dose at least 3 months after third dose
Johnson & Johnson At least 28 days after your first dose At least 2 months after second dose
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Available locations

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.

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

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.