The experts were reacting to the actions on Friday of an advisory committee to the Food and Drug Administration. That panel’s recommendation that the boosters be authorized was paired with its rejection of moving toward a blanket authorization for everyone 16 and older. The only Covid-19 vaccine for which the F.D.A. has enough information to determine a booster shot’s effectiveness is the one made by Pfizer-BioNTech. The timing for the other two vaccines in use in the United States, Moderna’s and Johnson & Johnson’s, is murky.

Source: New York Times September 18, 2021 18:22 UTC