If you are moderately or severely immunocompromised and initially received two doses of an mRNA series (Pfizer or Moderna), the Centers for Disease Control and Prevention and the Wisconsin Department of Health Services recommends you get:
- One additional mRNA dose at least 28 days after the second dose of your initial COVID-19 vaccine series.
- One booster dose at least six months after your additional mRNA dose.
If you are immunocompromised and initially received one dose of Johnson and Johnson, you should get:
- One booster shot (either Pfizer, Moderna, or Johnson & Johnson) at least two months after your initial Johnson & Johnson dose.
If you are immunocompromised and you were vaccinated internationally with a vaccine on WHO’s Emergency Use Listing (EUL), you may receive:
- One additional dose of the Pfizer vaccine at least 28 days after receiving the second vaccine dose of your primary series. This applies to everyone 12 and older.
- For people 18 and older, one booster dose at least six months after your additional Pfizer dose.
Additional doses are different from boosters. Learn more about the difference between booster shots and additional doses. Consult your health care provider with questions.