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Moderna recommends third Covid booster shot as delta variant spreads

04:08

Moderna has become the latest Covid-19 vaccine manufacturer to recommend a third booster shot as the delta variant continues to spread across the country. Assistant Professor of emergency medicine at Saint Joseph’s Hospital, Dr. Anand Swaminathan, joins News NOW to discuss calls for a third booster shot and whether Americans will need a booster for every emerging Covid-19 variant.