Becker's Healthcare July 5, 2022
The omicron subvariant BA.5 is quickly gaining prevalence in the U.S. and now accounts for nearly 54 percent of all cases, according to the CDC’s latest variant proportion update for the week ending July 2.
On June 25, CDC estimates showed the strain accounted for about 37 percent of cases. It’s closely related to omicron subvariant BA.4, which is estimated to account for nearly 17 percent of cases. BA.4 and BA.5 have become known as “sister variants” since they were first discovered in South Africa last winter. Collectively, they make up 70 percent of U.S. cases, estimates show.
Experts for months had predicted BA.5 would become dominant, pointing to how the strain made larger week-by-week jumps than earlier variants that went on to become dominant. On June 4, estimates showed...