"Masks stop respiratory droplets sometimes!" is a ridiculous exercise in surrogate outcomes
We KNOW that masks are unlikely to prevent community acquired infections. THAT'S what we care about, not some statistics on particulate movement #COVID19
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"Further research should focus on examining the efficacy of facemasks against specific infectious threats such as influenza and tuberculosis, assessing the efficacy of cloth masks, investigating common practices such as reuse of masks, assessing compliance,..." So no one knows?
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All studies end with a sentence about further research. It doesn't mean no one knows anything on the topic. It means we dont know everything on the topic. Important distinction. Decisions need to be made based on available evidence.
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