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Seriously though, it would be an interesting experiment to know how effective a spreader a foolish person like a hair stylist who works when sick actually is.
It won't be a perfect measure of course, because you have the people getting the haircut who were certainly exposed, but if they're children or both were masked may not have developed an infection. And beyond those people, you have everyone else who was around - maybe junior was getting the haircut, but mom and little sister were there too.
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