LOS ANGELES, June 7 (Xinhua) -- The BA.4 and BA.5 subvariants of Omicron are estimated to make up nearly 13 percent of all new U.S. COVID-19 cases in the latest week, the U.S. Centers for Disease Control and Prevention (CDC) said on Tuesday.
BA.4 made up 5.4 percent of the new cases for the week ending June 4, while BA.5 made up 7.6 percent during the same time, according to CDC estimates.
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