LOS ANGELES, May 25 (Xinhua) -- COVID-19 cases are surging again in the United States, powered by a rising tide of Omicron subvariants circulating rapidly across the country.
A new form of the Omicron subvariant, known as BA.2.12.1, has become the dominant strain among new U.S. COVID-19 cases, according to the latest estimates released by the U.S. Centers for Disease Control and Prevention (CDC) on Tuesday.
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