On December 11, 2020, the F.D.A. authorized Pfizer's<unk> for emergency use for the prevention of<unk> -19. Since then, many other<unk>  have been developed, such as the ones from Pfizer, Moderna, AstraZeneca, Janssen, Sinovac, Sinopharm and Gamaleya. Efficacy, side effects and safety profiles vary dramatically between them, as they are produced using different strategies.
Fully vaccinated persons with a negative recent<unk> -19 test are now being accepted for entering the U.S.
COVID-19 vaccines
MMR vaccine
HIV vaccine
Malaria vaccine
COVID-19 interventions
Ebola vaccines
Traveller vaccination
Polio vaccine