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Doctor says more data needed to determine vaccine's efficacy against COVID-19 variants

Drugmaker Moderna said its vaccine works against some emerging variants of the coronavirus. The company released the results of a new study it performed, which wasn't peer-reviewed. Dr. Ron Elfenbein, the medical director and owner of FirstCall Medical Center, spoke with Anne-Marie Green and Vladimir Duthiers on CBSN about this preliminary study, why more studies are needed and why people shouldn't worry.
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