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Smart Air - Do masks prevent flu infection? This is what happened when researchers randomly assigned people to wear surgical masks, N95 masks, or NO mask: https://www.quora.com/How-effective-are-surgical-masks-in- preventing-viruses/answer/Thomas ...
Face masks recommended to help prevent flu transmission | News | Harvard T.H. Chan School of Public Health
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Articles - Medical masks and flu transmission - Emerging Pathogens Institute - University of Florida