June 14, 2022 - A pair of omicron subvariants newly circulating in the U.S. were responsible for more than 1 in 5 coronavirus infections last week, according to estimates from the Centers for Disease Control and Prevention.

More than 21% of new cases last week were attributable to BA.4 and BA.5, according to CDC data. It’s a significant increase from 13% of infections the week prior and 7% the week before that.

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