DWQA Questions › Tag: KN95 face mask
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Have the careful scientific studies, which essentially show no effectiveness of facemask use to prevent transmission of respiratory virus infections like influenza and COVID-19, been interfered with to discourage rigorous use and add to fears, or are there methodological problems, like many of the masks in use, such as cloth masks and surgical masks, being poorly effective compared to KN95 grade face masks?
ClosedNicola asked 3 years ago • 
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