Moderately or severely immunocompromised people age 5 or older who received an initial mRNA COVID-19 vaccine primary series should receive an additional primary dose of the same mRNA COVID-19 vaccine at least 28 days after the second dose. Moderately or severely immunocompromised people age 18 or older who received the Johnson & Johnson vaccine should receive a single dose of an mRNA vaccine (Pfizer or Moderna) at least 28 days after their first dose.
See additional recommendations for people who are moderately to severely immunocompromised. A second booster dose has been authorized for certain people at increased risk of severe disease. Please talk to your doctor if you have questions.