"Right now, there's no evidence that [wearing face masks] is going to help prevent that infection," Chiu, a professor of laboratory medicine at the University of California, San Francisco, told CNN. "I would not recommend that someone in the US who does not have direct exposure, did not recently travel to China...or in general that you go buy a face mask." 近期来看， 你不需要买口罩 1。 SURGICAL MASK病人要带，减少传播，正常人带，起的作用很小
[size=1.2]Surgical masks: While they do protect from large respiratory droplets (a spray from a sneeze or mucus from a cough), they don't prevent against airborne droplets. Surgical masks aren't considered respiratory protection by the CDC because they don't filter smaller particles, and therefore isn't effective in totally preventing coronavirus transmission. [size=1.2]"Wearing a surgical mask helps you prevent sharing your germs if you're sick," Saskia Popescu, a hospital epidemiologist and infection prevention expert, told CNN. "Surgical masks do not seal around the face, so while they offer some protection, it's the N95 mask that offers the most protection."
[size=1.2]2。The CDC does recommend that healthcare providers wear N95 respirators, face masks that filter at least 95% of airborne particles, if they treat a patient infected with the novel coronavirus. 医疗系统的需要n95 3. 普通人带不好n95,正确带才有效， 带的方式不对的话，或者取下来的时候会适得其反
[size=1.2]Another reason not to wear an N95 mask: Physicians are also regularly fitted for the N95 respirators, and there's a proper way to wear them to ensure there's no open space and the mask fits snugly against the face. People with no medical training might wear it incorrectly, Popescu said. [size=1.2]Plus, Chiu said, N95 respirators are "quite uncomfortable" to wear for long periods of time -- and taking it off negates the effects of wearing it.
This is targeted people in the US. "I would not recommend that someone in the US who does not have direct exposure, did not recently travel to China...or in general that you go buy a face mask."
“ told CNN. "Surgical masks do not seal around the face, so while they offer some protection, it's the N95 mask that offers the most protection." 手术口罩没有在脸周围形成封闭，所以虽然它们能起到一些防护作用，但最能起到防护作用的是N95。
"Right now, there's no evidence that [wearing face masks] is going to help prevent that infection," Chiu, a professor of laboratory medicine at the University of California, San Francisco, told CNN. "I would not recommend that someone in the US who does not have direct exposure, did not recently travel to China...or in general that you go buy a face mask."
近期来看， 你不需要买口罩
1。 SURGICAL MASK病人要带，减少传播，正常人带，起的作用很小
[size=1.2]Surgical masks: While they do protect from large respiratory droplets (a spray from a sneeze or mucus from a cough), they don't prevent against airborne droplets. Surgical masks aren't considered respiratory protection by the CDC because they don't filter smaller particles, and therefore isn't effective in totally preventing coronavirus transmission.
[size=1.2]"Wearing a surgical mask helps you prevent sharing your germs if you're sick," Saskia Popescu, a hospital epidemiologist and infection prevention expert, told CNN. "Surgical masks do not seal around the face, so while they offer some protection, it's the N95 mask that offers the most protection."
[size=1.2]2。The CDC does recommend that healthcare providers wear N95 respirators, face masks that filter at least 95% of airborne particles, if they treat a patient infected with the novel coronavirus.
医疗系统的需要n95
3. 普通人带不好n95,正确带才有效， 带的方式不对的话，或者取下来的时候会适得其反
[size=1.2]Another reason not to wear an N95 mask: Physicians are also regularly fitted for the N95 respirators, and there's a proper way to wear them to ensure there's no open space and the mask fits snugly against the face. People with no medical training might wear it incorrectly, Popescu said.
[size=1.2]Plus, Chiu said, N95 respirators are "quite uncomfortable" to wear for long periods of time -- and taking it off negates the effects of wearing it.
RE.
眼睛也是因为飞沫传染。所以病人戴口罩还是会有用的。
fakr news :)
当然有用。但他说也没错，他说的有直接传染源 。其实如果包的好，包的厚，全身包了，病毒肯定感染不了。
是的，我家里人生病，我们都带口罩，就是药店买的一般医用口罩，事实证明是有用的。
CNN嘛，假的都能说成真的！
会适得其反把，估计美国其他人都信了，就华人不信，还是呗华人买光了。
甭管谁信，都是代购的
I got the same info from my local news. This virus is too small for most of the masks so masks probably won't do you any good.
流感病毒又不是自己在空气中飞来飞去的，而是附着在空气中的小颗粒上，挡住了小颗粒就挡住了大部分病毒
艾滋病毒也比套套的空隙小很多。 但是套套还是证明了有效防止艾滋病。因为套套阻挡了携带病毒的液体。
病毒不是自己在空气里飘来飘去阿，都是附着在大颗粒的飞沫或者什么上面，戴口罩肯定是有帮助的。
华人近视的多，戴眼镜的多有天然防疫加成
记得你说你想买口罩但是没买到，所以现在就叫光戴口罩没用？即使没带眼镜，口罩也能阻止一部分病毒，不讲剂量只讲0/1这不是抬扛么。况且早早买了口罩的人，肯定也早早下手买safety glass和带框架眼镜了
这次冠状病毒的直径125nm=0.125um (微米）
病毒要吸附飞沫或飞尘传播，不会自己起飞的。
正解
Reeeee 最烦媒体这时候凑热度
Re.
对流感有用王祖蓝说他感冒，他和他老婆晚上睡觉都戴个口罩，就不会被传染
这个同感真是有用的。带了再加每次接触后洗手。
3微米啊……那口罩是真的作用有限了。