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Expert weighs in on vaccine efficacy against omicron variant
A growing number of countries are reporting cases of the coronavirus' omicron variant, and many are mandating travel bans. Meanwhile, advisors to the U.S. Food and Drug Administration have now endorsed drug maker Merck's pill to treat COVID-19 in high-risk adults. All of this comes as public health officials are emphasizing the need for global cooperation. Nick Schifrin reports.
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