LOS ANGELES, Dec. 20 (Xinhua) -- A new coronavirus subvariant JN.1 is spreading fast in the United States, becoming a significant contributor to new COVID-19 cases in the country.
JN.1 is responsible for 21.4 percent of new infections across the country and has become the fastest-growing strain of the virus, according to the U.S. Centers for Disease Control and Prevention (CDC).
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