if this works, doesn't this imply a lot of the exhaled breath is unfiltered?https://twitter.com/MDiPaolaMD/status/1293311712507166720 …
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Good call. On amazon a box of 50 surgical ones is £22 - £3 more than non surgical ones. But if yo go N95 they are like £8 each
Thanks. Twitter will use this to make your timeline better. UndoUndo
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