While only booster doses of Pfizer and Moderna have been announced, Murthy said they are waiting on efficacy data for a second Johnson & Johnson shot. "We anticipate the people who receive J&J will likely need a booster as well," Murthy said. MORE: Why you shouldn't rush to get a COVID-19 vaccine booster shot before it's your turn Asked about the safety of taking a third shot, Murthy emphasized that the booster distribution plan is "contingent on the (Food and Drug Administration) FDA and the (Centers for Disease Control and Prevention) CDC Advisory Committee doing their full and independent evaluation."...