B.1.1.7 Variant Now Most Common Virus Strain in U.S., CDC Says

The B.1.1.7 variant of the coronavirus, first found in the U.K., has overtaken the initial form of the virus in the U.S. and is now the country’s most common strain, the head of the Centers for Disease Control and Prevention said Wednesday.

CDC Director Rochelle Walensky said at a briefing that the version had overtaken other mutations that have emerged, as well as the initial version of the virus in the U.S.