Doctor explains why COVID-19 variants are more contagious

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Some preliminary studies are shedding light on the new coronavirus variants spreading around the globe. Dr. Susannah Hills, a pediatric airway surgeon and assistant professor of ENT at New York Presbyterian/Columbia University, joins CBSN to explain what we know about several of the major variants, plus the idea that people who’ve recovered from COVID-19 may only need one dose of vaccine.



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