A wave of cases of the BA.2 omicron subvariant appears to finally be hitting the U.S.
Although the country’s Covid hospitalizations are at an all-time low, average daily case numbers have risen by 9 percent in the last two weeks, according to NBC News’ tally. Many experts agree that the true scale of the virus’s spread is far larger, because infections are being undercounted.
BA.2 accounts for around 86 percent of U.S. cases, according to the Centers for Disease Control and Prevention. But some of the agency’s guidelines about masking, testing and isolation have changed since the big omicron case wave earlier this year.