A woman takes a coronavirus disease (COVID-19) test at a pop-up testing site as the Omicron coronavirus variant continues to spread in Manhattan, New York City, U.S., December 27, 2021. REUTERS/Jeenah Moon

Dec 28 (Reuters) – The Omicron variant was estimated to be 58.6% of the coronavirus variants circulating in the United States for the week ending Dec. 25, according to data from the U.S. Centers for Disease Control and Prevention (CDC).

The fast-spreading variant was first detected in southern Africa and Hong Kong in November, with the first known case in the United States identified on Dec. 1 in a […]

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