If you are immunocompromised, and you have received an additional dose, you will be eligible to receive a booster:


After a primary series of Pfizer (2 doses + 1 additional dose) you can get a 4th dose 6 months (180 days) after the last dose.


After a primary series of J&J (1 dose + 1 additional dose) you can get a 3rd dose 2-6 months (60 days or longer) after the last dose.