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.
Another US Covid-19 surge may look different, experts say, particularly for younger people. Here's how
Experts say Covid-19 vaccinations in the United States are going extremely well -- but more people need to be protected and the country may be at the start of another surge.