The two sublineages, which were added to the World Health Organisation’s monitoring list in March and designated as variants of concern by the European Centre for Disease Prevention and Control , were present in all U.S. regions.
Last month, South African scientists found that the sublineages of the Omicron coronavirus variant can dodge antibodies from earlier infection well enough to trigger a new wave. BA.4 made up 5.4% of the variants in the country for the week ending June 4, according to CDC estimates, while BA.5 made up 7.6% of the variants during the same time.
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