The highly transmissible BA.5 omicron subvariant is now the dominant coronavirus strain in the U.S., accounting for nearly 54% of Covid-19 infections last week, according to the CDC.
The highly transmissible BA.5 omicron subvariant is now the dominant coronavirus strain in the U.S., accounting for nearly 54% of Covid-19 infections last week, according to
from the Centers for Disease Control and Prevention, as cases rise and drug companies work to reformulate vaccines to target new virus strains known for their ability to evade antibodies.BA.5 and the closely related omicron substrain BA.4 comprised 70% of coronavirus infections for the week ending July 2, according to CDC estimates, which may be subject to changes.
The BA.2.12.1 variant, which helped fuel a spike in Covid-19 cases when it was dominant in the spring, accounted for only 27% of cases last week. The news comes a week after the Food and Drug Administration recommended that pharmaceutical companies their coronavirus vaccine booster shots by the fall to target BA.4 and BA.5, in anticipation of a winter Covid-19 surge.have been on the rise in recent months, with the United States averaging 94,345 new infections per day in the week ending July 4, more than triple the 30,558 daily cases reported as of April 10, but well below the January peak of more than 800,000 per day.
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