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Dr. Gandhi on businesses requiring proof of vaccination: 'It would have a big impact'

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University of California San Fransisco Professor of Medicine, Dr. Monica Gandhi, explains the role that private companies can play in increasing coronavirus vaccination rates and breaks down how Covid-19 testing should change as the Delta variant spreads. "Everyone is so tired of the pandemic that you will see that places like businesses can have a huge impact," she tells Stephanie Ruhle.