As Infections Rise, C.D.C. Urges Some Vaccinated Americans to Wear Masks Again
In communities with growing caseloads, vaccinated and unvaccinated people should return to wearing masks indoors in public areas, health officials said.
More Contagious Virus Variant Is Now Dominant in U.S., C.D.C. Chief Says
The B.1.1.7 variant, first identified in Britain, is now the source of most new coronavirus infections in the United States, the director of the Centers for Disease Control and Prevention said.