Omicron Variant Spreads Across The U.S.

Cases of the Omicron variant have now been detected in 40 countries and at least 13 U.S. states. Concern is growing as health officials warn that numbers are expected to climb.» Subscribe to NBC News: http://nbcnews.to/SubscribeToNBC » Watch more NBC video: http://bit.ly/MoreNBCNews

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Omicron Variant Spreads Across The U.S.