re: Do you know anyone that’s been completely shut in for a year?

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and nobody has claimed it does

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Not so sure that's true and even if it is....lot's of people believe that these cloth mask are legit protection.

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It reduces the risk of transmission

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Meh, if it's the right kind of mask, and it's worn properly and you don't ever pull it down to talk, eat or drink then it reduces the risk by a small percentage.