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The F.D.A. authorizes Moderna and J.&J. boosters and allows a mix-and-match booster strategy.


By BY NOAH WEILAND AND SHARON LAFRANIERE from NYT U.S. https://www.nytimes.com/2021/10/20/us/politics/fda-mix-match-covid-booster-shots.html?partner=IFTTT
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