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How effective are surgical masks in preventing diseases?

April 26, 2017diseases effective Masks surgical

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How effective are surgical masks in preventing diseases?

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http://www.latimes.com/media/photo/2009-04/46581328.jpg 1. Surgical Masks which keep you from sending fluids out (sneezing/coughing) and keep fluids from going in (i.e. someone sneezes in front of you). These do not fit snug and force air through a filter.