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So if they don't work for the flu, which is a virus, why would they work any differently for Coronavirus? Short answer: they don't. "In our systematic review, we identified 10 RCTs that reported estimates of the effectiveness of face masks in reducing laboratory-confirmed influenza virus infections in the community from literature published during 1946–July 27, 2018. In pooled analysis, we found no significant reduction in influenza transmission with the use of face masks (RR 0.78, 95% CI 0.51–1.20; I2 = 30%, p = 0.25)" https://wwwnc.cdc.gov/eid/article/26/5/19-0994_article?fbclid=IwAR3ASxBUrRE5LHeZsZF-iHrpTuX2PprS8FnkKGUpEUDEIAnH6s5wQOpkOJI
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