4 ms·
>Surgical masks are not effective at preventing infection. They are effective at spreading infection. This is a common misconception, for which CDC is also par
by wetpaws 7y ago
>Surgical masks are not effective at preventing infection. They are effective at spreading infection.
This is a common misconception, for which CDC is also partially the one to be blamed.
Laboratory tests find that improvised cloth masks block 60 – 80% of virus particles
Most experts in the early 2000s agreed that these masks were probably better than nothing.
https://bmjopen.bmj.com/content/bmjopen/5/4/e006577.full.pdf https://bmjopen.bmj.com/content/bmjopen/5/4/e006577.full.pdf
https://www.cambridge.org/core/services/aop-cambridge-core/content/view/0921A05A69A9419C862FA2F35F819D55/S1935789313000438a.pdf/testing_the_efficacy_of_homemade_masks_would_they_protect_in_an_influenza_pandemic.pdf https://www.cambridge.org/core/services/aop-cambridge-core/c...
http://akkie.mods.jp/2019-nCoV/images/c/c0/%E3%82%B5%E3%83%BC%E3%82%B8%E3%82%AB%E3%83%AB%E3%83%9E%E3%82%B9%E3%82%AF%E5%8C%BB%E7%99%82vs%E5%B8%82%E4%B8%AD%E6%84%9F%E6%9F%93%E4%BA%88%E9%98%B2%EF%BC%9A%E7%B7%8F%E8%AA%AC_%282015%2C_MacIntyre%29.pdf http://akkie.mods.jp/2019-nCoV/images/c/c0/%E3%82%B5%E3%83%B...
- bregma 7y ago> Laboratory tests find that improvised cloth masks block 60 – 80% of virus particles How many virus particles do you need to become infected? Is 20% of the load in a typical aerosol droplet from an asymptomatic infected person above or below that critical number?
- wetpaws 7y agohttps://www.thelancet.com/journals/laninf/article/PIIS1473-3099(20)30232-2/fulltext https://www.thelancet.com/journals/laninf/article/PIIS1473-3... >higher viral loads associated with severe clinical outcomes
- sudosysgen 7y agoIt's a numbers game. There is a certain probability that each virion can spur and infection, so the less you get the better. If virions had a 100% infection chance then sure, but it's much lower than that.