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But when the researchers looked at smaller aerosol particles that are hardest to block, protection ranged from near zero with a face shield to about 30 percent protection with a surgical mask. The research showed that most masks could block very large particles, like those from a sneeze. ( Watch this video to see the “knot and tuck” method.) Covering the surgical mask with a cloth mask, a technique known as double masking, reduced exposure to the simulated cough particles by 83 percent.Ī Virginia Tech study looked at how well homemade masks, surgical masks and face shields protected the wearer, based on particle size. But knotting the loops and tucking in the sides of the medical mask reduced exposure by nearly 65 percent. One study from the Centers for Disease Control and Prevention found that a standard surgical mask only protected the wearer from about 7.5 percent of the particles generated by a simulated cough. And a Tennessee study found that communities with mask mandates had lower hospitalization rates than areas where masks weren’t required.Ī number of laboratory studies have also documented that a mask protects the person who is wearing it, though the level of that protection can vary depending on the type of mask, the material it’s made from, the experimental setup and how particle exposure was measured.īut the bottom line of all the studies is that a mask reduces the potential exposure of the person wearing it. During a hotel outbreak in Switzerland, for instance, several employees and a guest who tested positive for the coronavirus were wearing only face shields (with no masks) those who wore masks were not infected.
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The amount of protection depends on the quality of the mask and how well it fits. And when fewer viral particles are floating around the room, the masks others are wearing would likely block those that have escaped.īut there is also plenty of evidence showing that masks protect the wearer even when others around them are mask-free.
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That’s because when an infected person wears a mask, a large percentage of their exhaled infectious particles are trapped, stopping viral spread at the source. It’s true that masks work best when everyone in the room is wearing one. If I’m the only person wearing a mask in a store or other indoor location, am I really protected from infection?