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Originally Posted by Hugh
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To be fair, the comment was about those on general sale to the public, which are not necessarily cotton.
Other factors are involved such as length of exposure.
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For every type of mask studied, risk reduction decreased as exposure duration increased -- so the longer you're exposed to the virus, the more likely you are to get it, even with a mask on, the researchers found.
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"But it does mean that a mask can't reduce your risk to zero. Don't go to a bar for four hours and think you're risk free because you're wearing a mask.
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Wearing a mask reduced infection risks by 24 percent to 94 percent, or by 44 percent to 99 percent depending on the mask and the exposure duration.
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So if you go out more often because you think it's safe because you're wearing a mask, you're wrong. The more often you go out, the more likely the mask is going to "fail" at some point.
Wearing glasses seems to be added protection, again not 100%. Not wearing glasses may account for the lower end of reduction in risk of just wearing masks.