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FILE — Receiving a Moderna COVID-19 vaccination in the Bronx on Sept. 23, 2021. The Food and Drug Administration set the stage Tuesday, Oct. 12, 2021, for a new round of decisions on which Americans should get coronavirus booster shots, releasing a review of data suggesting that a half-dose booster of Moderna’s vaccine at least six months after the second dose increased antibody levels. But the agency did not take a position on whether an additional shot was necessary. (James Estrin/The New York Times)