The U.S. could be facing its worst surge of COVID-19 yet. Nearly 80 percent of counties are considered to be either areas of high or substantial transmission. And even though 70 percent of U.S. adults are now vaccinated, millions of Americans still refuse to get the shot. Dr. Brian Castrucci is the president and CEO of the de Beaumont Foundation and a leading voice on public health issues. Soledad O’Brien talks with him about fighting vaccine hesitancy.

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