More contagious omicron BA.2 subvariant now dominant in the U.S., CDC says
A woman takes a coronavirus disease (COVID-19) test at a pop-up testing site in New York City, January 12, 2022.Brendan McDermid | ReutersThe more contagious omicron subvariant, BA.2, is now the dominant version of Covid-19 in the U.S.,…