布製マスクの使用はサイエンスではなく同調の問題 https://t.co/lRw91aoARo SARS-CoV-2のサイズは0.07-0.09μmだがこれより大きい飛沫で運ばれるためN95マスク(0.3μmの粒子の95%をカット)ならば機能。しかし布製マスクの繊維の隙間はM95マスクの1000倍。着用は政治的忠誠心の表現でしかない。
— Spica (@Kelangdbn) May 22, 2020
But even so, the most optimistic estimates suggest that cloth coverings only have a minor effect on your chances of breathing in (or expelling) droplets containing a virus. A small study of 21 healthy people concluded that a “homemade mask should only be considered as a last resort to prevent droplet transmission from infected individuals, but it would be better than no protection”.
最後の手段としては有用で、
Dr. Dweik confirms that those homemade masks, often made of material like cotton, won’t do much to protect you from inhaling particles that carry the virus. But they do protect wearers from possibly spreading the virus to others.
“There is evidence that such masks reduce the exhaled aerosols from infectious, but asymptomatic, individuals.” he says. By blocking the exhale of virus particles in to the air around you, your mask is keeping the virus from spreading.
布もいろんな種類の繊維を重ねると、
Aerosol Filtration Efficiency of Common Fabrics Used in Respiratory Cloth Masks
Abhiteja Konda, Abhinav Prakash, Gregory A. Moss, Michael Schmoldt, Gregory D. Grant, and Supratik Guha*
Cite this: ACS Nano 2020, 14, 5,
Overall, we find that combinations of various commonly available fabrics used in cloth masks can potentially provide significant protection against the transmission of aerosol particles.
予防につながるという研究結果もあるわけだね。
いずれにせよ、マスクは息苦しくて嫌い。布マスクで息しやすいとか宣伝したのがあったけど、あれは、逆に感染防止用としては効果は薄れるんじゃないかね？
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