The Omicron subvariant XBB.1.5 has likely become the dominant variant in the United States, accounting for 61.3% of COVID cases in the week ended Jan. 28, data from the U.S. Centers for Disease Control and Prevention showed on Friday.
XBB.1.5, which is currently the most transmissible variant, is an offshoot of XBB, first detected in October.
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