COVID-19 Booster Vaccine Information Brown Medicine follows RI Dept. of Health (RIDOH) and CDC guidance for booster shots. At this time, booster shots are available for persons who are not immunocompromised and initially vaccinated with the Pfizer-BioNTech, Moderna or Johnson and Johnson (Jansen) vaccine; as well as for moderate to severely immunocompromised persons who have already received ....