LOS ANGELES, July 8 (Xinhua) -- The newer and most contagious Omicron subvariants, known as BA.4 and BA.5, now made up over 70 percent of COVID-19 infections in the United States, according to data released by the U.S. Centers for Disease Control and Prevention (CDC) this week.
The BA.5 subvariant accounted for 53.6 percent of new infections in the latest week ending July 2, while BA.4 accounted for 16.5 percent of the new infections, CDC data showed.
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