There are already dozens of cases across almost half of the U.S. of a new Covid subvariant that's even more contagious than the already highly transmissible omicron variant.
Nearly half of U.S. states have confirmed the presence of BA.2 with at least 127 known cases nationwide as of Friday, according to a global data base that tracks Covid variants. The Centers for Disease Control and Prevention, in a statement Friday, said although BA.2 has increased in proportion to the original omicron strain in some countries, it is currently circulating at a low level in the U.S.
The new sublineage doesn't appear to further reduce the effectiveness of vaccines against symptomatic infection, according to the U.K. Health Security Agency.
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