A new study has confirmed that surgical masks reduce the spread of COVID-19 and confirms the impact of mask-wearing on communities. For more, KCBS Radio's Margie Shafer spoke with Dr. Stephen Luby, Medical Epidemiologist and Professor of Medicine at Stanford University, senior author of the study. 

<p>A new study has confirmed that surgical masks reduce the spread of COVID-19 and confirms the impact of mask-wearing on communities. For more, KCBS Radio's Margie Shafer spoke with Dr. Stephen Luby, Medical Epidemiologist and Professor of Medicine at Stanford University, senior author of the study.&nbsp;</p>

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