Hopes of Covid-19 Reprieve Fade as BA.5 Subvariant Takes Over

Covid-19 is circulating widely as the BA.5 Omicron subvariant elevates the risk of reinfections and rising case counts, spoiling chances for a summer reprieve from the pandemic across much of the U.S. Covid-19 levels are high in a fifth of U.S. counties, according to the Centers for Disease Control and Prevention’s metric based on case and hospital data, a share that has been mostly rising since mid-April. BA.5 is estimated to represent nearly two in three recent U.S. cases that are averaging just more than 100,000 a day, CDC data show. The true number of infections may be roughly six times as high, some virus experts said, in part because so many people are using at-home tests that state health departments largely don’t track.