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A study led by Emily Sickbert-Bennett, PhD, associate professor of infectious diseases at the UNC School of Medicine and director of UNC Medical Center Infection Prevention, and William D. Bennett, PhD, professor of medicine in the UNC Center for Environmental Medicine, Asthma, and Lung Biology, shows that wearing two masks can significantly increase the effectiveness of preventing the spread of COVID-19, but is heavily dependent on how well they fit over a person’s nose and mouth.

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