Countries worldwide hit new records for virus cases, deaths
Ambulances filled with breathless patients lined up in Brazil as nations around the world set new records Thursday for COVID-19 deaths and new coronavirus infections. The disease surged even in...
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.