New Covid-19 cases in the U.S. continued to drift lower Saturday, staying below 50,000 for the eighth consecutive day as the Food and Drug Administration authorized convalescent plasma as a treatment for serious coronavirus cases.
Total U.S. coronavirus cases rose to nearly 5.7 million, just under a quarter of the global tally, while the nation’s death toll surpassed 176,500, according to data compiled by Johns Hopkins University. Globally, more than 23 million people have been infected, the figures show, and more than 806,000…