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Expert breaks down Delta variant fueling U.S. surge in COVID-19 cases

The Delta variant of COVID-19 is running rampant in the U.S. Amid a surge in coronavirus cases, the Centers for Disease Control and Prevention is adjusting its mask-wearing guidance for vaccinated people. John Moore, a professor of microbiology and immunology at Weill Cornell Medical College, joined CBSN's Tanya Rivero to discuss.
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