The omicron variant is now the dominant strain of COVID-19 in the United States, according to federal tracking.

Centers for Disease Control and Prevention data show that omicron accounted for more than 73% of COVID-19 cases last week, up from about 13% the week prior. The agency revised its data Monday to reflect an increase in confirmed omicron cases the week ending Dec. 11, which was initially estimated to be about 3%.

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