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CDC Tells Some Vaccinated People to Mask Up as Delta Surges

Jul.27 -- Rochelle Walensky, director of the U.S. Centers for Disease Control and Prevention, says fully vaccinated people should go back to wearing masks indoors in places where coronavirus infections are soaring as the country faces a surge in cases driven by the fast-spreading delta variant. She speaks in a call with reporters. (Audio only. Excerpts)
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