Additional Doses & Boosters

About Boosters & Additional Doses of COVID-19 Vaccine

A COVID-19 booster is given when a person has completed their vaccine series, and protection against the virus has decreased over time. An additional dose, originally called a third dose, is given to people with moderately or severely compromised immune systems [external link] to improve their response to the initial vaccine series. Everyone aged 5 years and older is recommended to get at least two doses of the COVID-19 vaccine. Some people need three doses for the highest level of protection. Others may need to get four or five doses depending on age and underlying medical conditions.

Current Recommendations 

Boosters

Following approval from the Food and Drug Administration (FDA) [external link], and the Center for Disease Control and Prevention (CDC) [external link], the new omicron vaccine doses or boosters, are now available.

  • Use the CDC’s COVID-19 Booster Tool [external link] to determine your eligibility for your next COVID-19 vaccine.
  • People ages 12 years and older are recommended to receive the omicron dose at least 2 months after completion of primary series or since their last booster dose.
  • People ages 18 and older who received Janssen COVID-19 vaccine as both their primary series dose and/or booster dose may receive the omicron dose at least 2 months after their last dose of COVID-19 vaccine. 

PFIZER

  • When: 5 months after receiving your last dose for children 6 months through 11 years and at least 2 months for those 12 years and older
  • Who: Everyone ages 6 months+

MODERNA

  • When: 2 months after receiving your last dose
  • Who: Everyone ages 18+

In addition, the CDC recommendations allow for “mixing and matching [external link],” meaning individuals have a choice to receive a different vaccine as a booster than what they originally received.

Additional Doses

  • People ages 6 months through 11 years who are moderately or severely immunocompromised are recommended to receive 3 doses of an mRNA COVID-19 vaccine as a primary series and an additional omicron dose at least 3 months after the last dose of a COVID-19 vaccine. 
  • People ages 12 years and older who are severely immunocompromised are recommended to receive 3 doses of an mRNA COVID-19 vaccine as a primary series and an additional omicron dose at least 2 months after their last dose of a COVID-19 vaccine.

People who are considered to be moderately to severely immunocompromised may include:

  • Those who have been receiving active cancer treatment for tumors or cancers of the blood.
  • Have received an organ transplant and are taking medicine to suppress the immune system.
  • Have received a stem cell transplant within the last two years or are taking medicine to suppress the immune system.
  • Are moderate or severe primary immunodeficiency (such as DiGeorge syndrome, Wiskott-Aldrich syndrome).
  • Have advanced or untreated HIV.
  • Are undergoing active treatment with high-dose corticosteroids or other drugs that may suppress your immune response.

For more information, see CDC's webpage on COVID-19 Vaccines for Moderately to Severely Immunocompromised People [external link].  

Questions?

Community members can call JCPH's COVID Vax Information Center (C-VIC) at 303-239-7000 and press option 1 for vaccine information.