Bivalent COVID-19 Booster Doses The US Food and Drug Administration (FDA) and US Centers for Disease Control and Prevention (CDC) have authorized and recommended bivalent boosters for COVID-19. Bivalent means these doses protect people against two strains of COVID-19, the original strain and the Omicron variant. The Moderna bivalent booster can be used by people age 18 or older. The Pfizer bivalent booster can be used by people age 12 or older. Rhode Island began ordering doses and anticipates these new bivalent boosters to be available during or soon after the week of September 12. Thank you for your patience while we update our online materials.