Advice from U.S. authorities on the need for face masks has flipped back and forth since Covid-19 took hold in 2020. In May, the Centers for Disease Control and Prevention said immunized Americans could ditch their masks in most settings. It reversed course in July amid a rise in cases caused by the more transmissible delta variant.

Topics:  u.s    covid-19   in may   centers   disease control   prevention   americans   july   advice   masks   variant   
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