We outline both the logic and previous existing studies for *source control* here. (Current as of few months ago).https://www.preprints.org/manuscript/202004.0203/v2 …
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Replying to @boriquagato
We didn't have many COVID specific studies at the population level at that paper (next update will include the natural experiment papers.) The reason I posted that is the source-control argument is important to acknowledge. Really changes what study is applicable to this.
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Replying to @zeynep @boriquagato
I mean you find a lot of this. …https://www-sciencedirect-com.libproxy.lib.unc.edu/science/article/pii/S0140673603131686 … Masks work to protect health-care workers. You find those across the board.
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Replying to @boriquagato
Right, and no doubt training+seal is very important for protecting oneself. But let me go here again, source control is different. I think this is my most plain-language analytic argument for why that's so.https://www.theatlantic.com/health/archive/2020/04/dont-wear-mask-yourself/610336/ …
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Replying to @boriquagato
I thought a lot about this, and am happy to follow through the challenge. Are you touching the outside? Better it's outside the mask than on your face, obviously no? Touching the inside? Well, it's your germs and that's exactly what we are trying to protect the world from.
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Replying to @zeynep @boriquagato
What is the scenario in which a no-mask situation is worse for the wearer than a mask scenario in the community? I cannot come up with realistic ones, and this is what I thought about most because that's a real argument against masks.
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(Also you don't have to block at the virion size, it's expelled in the droplet which is considerably bigger. And since you note dose matters, it helps even if most of it is blocked)
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