Reason that past clinical studies, focusing on health-care worker outcomes, are not the best indicator is that masks for *source-control* is not an individual level variable. It's like asking if filters on car exhausts lower air pollution by measuring the air ... inside each car.
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A few country new comparison studies are out. (I'll collect them). They all lean in the same direction, masks being protective. Again confounded but evidence keeps adding in the same direction, past source control plus lab studies showing droplets block plus natural experiments.
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