Dr. Amesh Adalja: 'Colleges are mass gatherings'

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Dr. Amesha Adalja joins Andrea Mitchell, discussing the reason behind rises in coronavirus cases in Europe, and outbreaks at American college campuses. "Colleges are mass gatherings, people coming from all over country," Dr. Adalja says, "There's so much social interaction going on both on and off campus, it's very difficult to keep those cases to a minimum."