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Facemasks block expired particles, despite leakage at edges, study finds

June 8, 2021

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A new study from the University of California, Davis and the Icahn School of Medicine at Mount Sinai confirms that surgical masks effectively reduce outgoing airborne particles from talking or coughing, even after allowing for leakage around the edges of the mask. The results are published June 8 in Scientific Reports.

Wearing masks and other face coverings can reduce the flow of airborne particles that are produced during breathing, talking, coughing or sneezing, protecting others from viruses carried by those particles such as SARS-CoV2 and influenza, said Christopher Cappa, professor of civil and environmental engineering at UC Davis and corresponding author on the paper.

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