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Face mask effectiveness: What science knows now (www.cbsnews.com)
submitted 1 year ago by FlyingSquid@lemmy.world to c/news@lemmy.world
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In an interview for 60 Minutes, CBS News chief medical correspondent Dr. Jon LaPook posed that question to Linsey Marr, a Virginia Tech University professor specializing in aerosol science.

"They are very helpful in reducing the chances that the person will get COVID because it's reducing the amount of virus that you would inhale from the air around you," Marr said about masks.

No mask is 100% effective. An N95, for example, is named as such because it is at least 95 percent efficient at blocking airborne particles when used properly. But even if a mask has an 80% efficiency, Marr said, it still offers meaningful protection.

"That greatly reduces the chance that I'm going to become infected," Marr said.

Marr said research shows that high-quality masks can block particles that are the same size as those carrying the coronavirus. Masks work, Marr explained, as a filter, not as a sieve. Virus particles must weave around the layers of fibers, and as they do so, they may crash into those fibers and become trapped.

Marr likened it to running through a forest of trees. Walk slowly, and the surrounding is easy to navigate. But being forced through a forest at a high speed increases the likelihood of running into a tree.

"Masks, even cloth masks, do something," she said.

Not that I expect most people to believe it at this point...

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[-] GoodbyeBlueMonday@startrek.website 9 points 1 year ago

Initially the CDC didn't know how much asymptomatic spread was going to be a factor: that definitely changes the math on advising everyone to mask up. By July of 2020 they were unequivocal: https://www.cdc.gov/media/releases/2020/p0714-americans-to-wear-masks.html

this post was submitted on 30 Oct 2023
526 points (97.1% liked)

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