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 January 28, data from the U.S. Centers for Disease Control and Prevention showed on Friday.
The subvariant accounted for 49.5% of cases in the week ended January 21, according to estimates from the CDC.
XBB.1.5, which is currently the most transmissible variant, is an offshoot of XBB, first detected in October.
The now-dominant XBB-related subvariants are derived from the BA.2 version of Omicron.
An analysis from CDC showed on Wednesday that updated COVID-19 boosters from Pfizer Inc/BioNTech SE and Moderna helped prevent symptomatic infections against the new XBB-related subvariants.
