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U.S. cities set new coronavirus measures as nation heads into possible fourth wave

Mask recommendations are making a comeback as the COVID-19 Delta variant rages across the U.S. Lilia Luciano reports from one of the nation's four hotspots. Then, Dr. Taison Bell, a critical care and infectious disease physician and the medical ICU director at the University of Virginia, joins CBSN's Lana Zak with more on the potential fourth coronavirus wave.

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