SAN FRANCISCO (KCBS RADIO) – Centers for Disease Control and Prevention director Dr. Rochelle Walensky is urging Americans to wear a mask this winter, and it's not just for COVID-19.
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To answer your questions, KCBS Radio news anchors Eric Thomas and Margie Shafer spoke with Dr. William Schaffner, professor of preventive medicine at Vanderbilt University School of Medicine, on "Ask An Expert."
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