COVID-19 Vaccine Booster Doses Booster doses of Pfizer, Moderna, and J&J COVID-19 vaccines are available for eligible people in Rhode Island. Eligible Rhode Islanders who received two doses of Pfizer or Moderna for their primary series of COVID-19 vaccine can get their booster doses at least six months after their second dose of Pfizer or Moderna. Eligible Rhode Islanders who received J&J for their primary series can get their booster dose at least two months after their first dose. We expect small changes in online systems for registration after October 22 to reflect new eligibility. Thank you for your patience. For more information on eligibility and booster doses, please visit https://covid.ri.gov/boosterdoses. Rhode Islanders can find appointments by vaccine type at VaccinateRI.org. If you need help making an appointment, please call 844-930-1779. Appointments are recommended and can help reduce your wait time.