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问题是戴口罩似乎用处很有限？
https://www.businessinsider.com. ... 020-1?r=US&IR=T
"根据疾病控制与预防中心（CDC）的说法，最好的预防措施是每天预防细菌的标准方法：经常洗手，尽量不要触摸脸部，以及避免与病人密切接触。
但是疾病预防控制中心已指示医疗保健提供者为任何出现流感样症状或最近去过武汉的患者提供口罩。这降低了潜在感染者可能通过唾液或痰将冠状病毒传播给他人的风险。疾病预防控制中心还建议治疗可能感染病人的医生和护士戴口罩和护目镜。但是对于普通人来说，口罩可能是不必要的。
口罩常见的有两种：外科口罩和N95呼吸器（也就是P2口罩）。 N95呼吸器可从周围空气中过滤掉大部分空气中的颗粒，从而防止佩戴者吸入直径小于0.3微米的颗粒。当由于野火烟雾或污染而导致空气质量差时，通常使用这些类型的面罩，并设计成紧密安装。但是，冠状病毒的直径为0.12微米。同时，外科口罩旨在防止大的水滴和飞溅物从人的口腔传播到附近的表面或人身上。它们旨在防止医疗保健提供者将自己的口腔传播细菌传播给患者。由于这一独特的目的，外科口罩比N95口罩更宽松."
“According to the Centres for Disease Control and Prevention (CDC), the best precautions are the standard, everyday ways to avoid germs: wash your hands frequently, try not to touch your face, and avoiding close contact with sick people.
However, the CDC has directed healthcare providers to give surgical masks to any patients that present flu-like symptoms or have recently travelled to Wuhan. That lowers the risk that a potentially infected person could spread the coronavirus to others via saliva or phlegm.
The CDC also recommends that doctors and nurses treating potentially infected patients wear masks and goggles.
But for the average person, a mask is likely unnecessary.
Face masks are designed to catch large contaminants and particles, including ones that might carry pathogens such as the coronavirus. There are two common kinds: surgical masks and N95 respirators.
N95 respirators filter out most airborne particles from the surrounding air, preventing wearers from breathing in particles down to 0.3 microns in diameter. These types of masks are often used when air quality is poor due to wildfire smoke or pollution, and they’re designed to be tightly fitted. However, the coronavirus is 0.12 microns in diameter.
Surgical masks, meanwhile, are designed to keep large particle droplets and splatter from passing from a person’s mouth to nearby surfaces or people. They’re meant to keep healthcare providers from spreading their own mouth-borne germs to patients. Surgical masks are looser-fitting than N95 respirators because of this distinct purpose."
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减肥，原理及方案讨论 (2011-5-17) 老杏 
楼主:astina
发表于 2020-1-26 15:43
发表于 2020-1-26 18:28
