Early Covid 19 Vaccines Will Require Two Shots
Both the Pfizer/BioNTech and Moderna vaccines, the two vaccine candidates currently seeking Food and Drug Administration (FDA) authorization, require two doses. As is true with many multi-dose immunizations, the first dose of these vaccines will help prime the immune system to create a response against SARS-CoV-2, the virus that causes COVID-19. Subsequent shots will help boost that immune response. On Thursday, a panel of experts recommended that the FDA approve a vaccine developed by Pfizer/BioNTech....