COVID-19 Vaccine Booster Dose On Friday, September 17, the US Food and Drug Administration (FDA) met to review data from Pfizer and to decide whether to authorize booster doses of the Pfizer-BioNTech COVID-19 vaccine. While they voted in favor of recommending a booster dose for select groups of people, CDC’s Advisory Committee on Immunization Practices (ACIP) makes recommendations about vaccines that the FDA has approved or authorized and then CDC sets the US adult and childhood immunization schedules based on those recommendations. As is practice, the Rhode Island Department of Health will wait for ACIP to issue its guidelines before authorizing the use of booster doses of COVID-19 vaccine in Rhode Island. ACIP is currently scheduled to meet on September 22 and September 23 to make a recommendation. A booster dose is a dose of a vaccine that is given to someone who is already vaccinated and received protection from that vaccination, but that protection decreased over time. Third or additional doses are currently available to Rhode Islanders who are moderately to severely immunocompromised.