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Everyone could wear a bandanna over nose and mouth.

If it reduces transmission by 20%, that would be a fantastic win due to reduction in exponential growth.

This is pretty much how most people implement the rule in Czech Republic for mandatory masks in public - anything that covers you mount and nose is fine, including self made cloth masks and even scarves. The government even said they are find with that at multiple ocasions.

So "I don't have a mask" is really no argument, as long as you have at least one piece of clothing on you, you can wrap it around your mount & nose. There, you have a mask.

I like the Czech pragmatism. Obviously it is not perfect, but anything that obstructs droplets even a bit is helping to flatten the curve, and that's what you want right now. This is one of the most reasonable and easy and pragmatic rules I have seen so far. It seems clearly superior to telling people, because there is a shortage, that masks are not preventing an infection, implying that they don't help.

Czech people have common sense.

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