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Health officials monitor COVID mutations as U.S. cases appear to level off

The number of new coronavirus cases and deaths in the United States appear to be leveling off, but health officials are monitoring two highly contagious mutations of the virus that have been circulating throughout the United Kingdom and South Africa. Carl Zimmer, a New York Times columnist, joins CBSN's "Red & Blue" anchor Elaine Quijano with the latest.
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