Omicron variant in U.S. found in traveler returning from South Africa with mild symptoms

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UP NEXT
Dr. Fauci: We don't know the definitive answer on the origins of Covid
06:17
The Truth about the Lab Leak theory
25:09
Lab leak? The raging debate over how Covid started
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Chris Hayes: What’s really at stake in the Covid origin debate
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Dr. Patel on Covid origins: We’ll likely never come to definitive conclusion
04:48
Biden: 'We've broken the Covid grip on us'
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