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Apparently no reports from that German experience, but recently researchers published a working paper with the results of "A randomized-trial of community-level mask promotion in rural Bangladesh during COVID-19 shows that the intervention tripled mask usage and reduced symptomatic SARS-CoV-2 infections ..." https://www.poverty-action.org/...


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JAMA has a randomized clinical trial in 2019: "N95 Respirators vs Medical Masks for Preventing Influenza Among Health Care Personnel". The finding is "there was no significant difference in the incidence of laboratory-confirmed influenza". Regarding Bavaria's N95/FFP2 respirator mandate, there's a graph of Bavaria vs Germany daily new ...


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