By MARILYNN MARCHIONE, AP Chief Medical Writer U.S. regulators on Thursday approved the first drug to treat COVID-19: remdesivir, an antiviral medicine given to hospitalized patients through an IV. The drug, which California-based Gilead Sciences Inc. is calling Veklury, cut the time to recovery by five days — from 15 days to 10 on average — in a large study led by the U.S. National Institutes of Health.