Boosters and additional doses

Vaccinated people may qualify for additional doses, depending on their COVID risk and the type of vaccine they received.

If you are eligible, make an appointment at your healthcare provider or pharmacy.


People who received 2 doses of the Pfizer vaccine and who meet eligibility requirements may receive a booster shot (third dose) of Pfizer. 


The CDC recommends that the following groups should receive a booster shot of Pfizer’s COVID-19 vaccine at least 6 months after receiving their second dose:

  • People aged 65 years and older
  • Residents aged 18 years and older in long-term care settings
  • People aged 50 to 64 years with underlying medical conditions

The CDC also recommends that the following groups may receive a booster shot of Pfizer’s COVID-19 vaccine at least 6 months after receiving their second dose, based on their individual benefits and risks:

  • People aged 18 to 49 years with underlying medical conditions
  • People aged 18 to 64 years at increased risk for COVID-19 exposure and transmission because of occupational or institutional setting

Talk to your healthcare provider about whether getting a Pfizer booster shot is right for you.

These recommendations only apply to people who previously received 2 doses of Pfizer vaccine.

We expect to receive booster guidance on Moderna and J&J in the coming weeks.

Get your booster shot from your healthcare provider or a local pharmacy.


If you have a moderately or severely compromised immune system, you may benefit from an additional dose of Moderna or Pfizer. See if you meet the eligibility criteria. These criteria only apply to those who received a 2 dose series of Moderna or Pfizer. 

We request that all eligible people first seek a third dose of the vaccine from a health care provider if you have one. If not, most vaccination sites can give additional doses. You will need to self-attest that you meet the specific criteria of health conditions. 

Additional doses can not be given sooner than 28 days after your last dose of Moderna or Pfizer.

Johnson & Johnson vaccine

If you got the Johnson & Johnson one dose COVID-19 vaccine, you are fully vaccinated. If you have talked to your healthcare provider and want to get a supplemental dose of Pfizer or Moderna, you may. 

To get a supplemental dose you must:

  • Discuss the risks and benefits with your healthcare provider
  • Self-attest you’ve consulted with your healthcare provider
  • Live or have gotten your Johnson & Johnson vaccine in San Francisco

List of SF Department of Public Health vaccine sites that can give supplemental doses:

  • AITC, Immunization and Travel Clinic
  • Zuckerberg SF General - Learning Center
  • Zuckerberg SF General - Pediatric Urgent Care (ages 12 and up)
  • Southeast Health Center
  • Maxine Hall Health Center
  • Mission- 24th & Capp UCSF/Unidos en Salud/BAPLS
  • Bayview Neighborhood Vaccine Site at 1800 Oakdale

Find out more about supplemental doses in the Health Advisory. 

Last updated October 05, 2021