A sign reminds customers that masks are required in their store in New York, the U.S., December 13, 2021. /CFP
The Omicron variant has been identified in at least 30 states in the United States, according to a Washington Post tally.
The U.S. total for COVID-19 confirmed cases surpassed 50 million on Monday, according to Johns Hopkins University.
Omicron has been noted as a variant of concern by the World Health Organization and the U.S. Centers for Disease Control and Prevention.
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