In this May 19, 2021, file photo, Centers for Disease Control and Prevention Director Dr. Rochelle Walensky testifies during a Senate Appropriations Subcommittee hearing to examine the FY 2022 budget request for the Centers for Disease Control and Prevention in Washington. Walensky said Wednesday, June 30 the CDC is leaving it up to local officials to set guidelines for mask-wearing as the highly contagious delta variant of the coronavirus surges in areas with low vaccination rates. (Greg Nash/Pool via AP, File)
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