Additional vaccine doses (booster shots and third doses)

Content verified September 26, 2022


With the CDC’s approval of a new Pfizer and Moderna booster on September 1, County-sponsored clinics must provide only the new boosters. People getting first or second doses are not affected.

Our booster clinics for ages 12+ have switched to the updated bivalent booster. Due to initial supply, we currently recommend appointments for these boosters. Maryland's Vaccine Locator provides information on pharmacies and other providers who also have booster appointments.

Novavax vaccine is available by appointment to persons age 12 and over. Learn more about Novavax and make an appointment.

You are up to date if you have completed a primary series and received the most recent booster dose recommended for you by the CDC.


Eligible people

Booster Shot Eligibility
Use the CDC's booster calculator
If you are You can get a booster With booster vaccine
5 to 11 years 5 months after completing primary series Pfizer-BioNTech COVID-19 Vaccine, Monovalent
12 years and older 2 months after completing primary series or getting the most recent booster dose with any authorized or approved monovalent COVID-19 vaccine. Moderna COVID-19 Vaccine, Bivalent or Pfizer-BioNTech COVID-19 Vaccine, Bivalent

People who are immunocompromised

See CDC COVID-19 vaccine and booster guidence for people who are moderately or severely immunocompromised. You may also be eligible for Evusheld.


Available locations

If you want a specific vaccine as your booster, check that your vaccination site has it available.

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

Your healthcare provider may have vaccine, too.


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.