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The BA.2 Omicron lineage was estimated to be 23.1% of the coronavirus variants circulating in the United States as of March 12, the U.S. Centers for Disease Control and Prevention (CDC) said on Tuesday.
Scientists are tracking a rise in cases caused by BA.2, which is spreading rapidly in parts of Asia and Europe.
According to the CDC’s data https://tabsoft.co/3i7HWSX, the BA.2 lineage now makes up 39% of total cases in regions including New Jersey, New York, Puerto Rico and Virgin Islands.
In states such as Connecticut, Maine, Massachusetts, New Hampshire, Vermont and Rhode Island, the BA.2 version of Omicron now makes up about 38.6% of total cases.
U.S. daily cases have started to decline in recent weeks after touching record levels in January, with the CDC dramatically easing its COVID-19 guidelines for masks, including in schools.
Initial data for BA.2, which has begun to displace Omicron’s more common BA.1 version around the world, shows no significant difference in disease severity, the World Health Organization said last month.
Among other versions of Omicron that have been circulating since December, BA.1.1, a descendant of BA.1 with one additional mutation, makes up around 66.1% of U.S. samples.
Largely displaced by BA.1.1, the BA.1 version of Omicron and another sublineage known as BA.3 are grouped together by CDC as B.1.1.529 and make up 10.8% of the cases.
Together, versions of Omicron add up to 100% of U.S. cases, with no other circulating variants detected, according to the CDC data.
Créditos: Comité científico Covid