Given CDC recommendation to use home made masks in the event of a mask shortage, here is a comparison of filtration properties of different materials ...
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Cambridge scientists tested 0.02 micron Bacteriophage MS2 particles (5 times smaller than the coronavirus) & compared homemade masks made of different materials to surgical masks.
Surgical mask blocks 89%
Vacuum cleaning bag 85%
Dish Towel 73%
T shirt 70%
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