F.D.A. Authorizes Coronavirus Booster Shots for All Adults November 21, 2021 Auto Bot Coronavirus (2019-nCoV), Food and Drug Administration, Moderna Inc, Pfizer Inc, United States Politics and Government, Vaccination and Immunization 0 If the C.D.C. agrees, adults who received a second shot of the Pfizer or Moderna vaccine at least six months ago could be eligible by this weekend.