Omicron now dominant coronavirus strain in new U.S. cases

People wait in line to get their COVID-19 vaccine shots.
(Image credit: Jim Watson/AFP via Getty Images)

The Omicron variant accounted for 73 percent of new coronavirus cases between Dec. 12 and 18, the Centers for Disease Control and Prevention said on Monday.

The Delta variant has been the driving force in U.S. infections for more than five months, with CDC data showing that at the end of last month, more than 99.5 percent of coronavirus cases were Delta. Omicron was first detected in southern Africa in late November, and has since been found in 90 countries. It's estimated that last week, more than 650,000 Omicron infections were reported in the United States.

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Catherine Garcia, The Week US

Catherine Garcia has worked as a senior writer at The Week since 2014. Her writing and reporting have appeared in Entertainment Weekly, The New York Times, Wirecutter, NBC News and "The Book of Jezebel," among others. She's a graduate of the University of Redlands and the Columbia University Graduate School of Journalism.