The Omicron BA.2 variant represents more than half of new Covid-19 cases in the U.S., the latest federal estimates show, as signs suggest infections are edging higher again in parts of the Northeast.
The region has the highest BA.2 concentrations, including more than 70% in an area including New York and New Jersey, according to estimates the Centers for Disease Control and Prevention released Tuesday. BA.2 has been moving steadily higher for more than a month and represents an estimated 55% of national cases in the week ended March 26, the CDC said.
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