鳩帶口罩一早有文獻講左冇用啦
你濕左有冇換罩
有冇帶n95呀
見到一大班市民四點起身搶口罩,搶到私家診所都唔夠口罩,真係好心up,而政府已經完全控制唔到恐慌情緒。
同時,明明係同一個知識體系,東西方醫學觀真係存在好大差異,外國人睇東亞人搶口罩,好似當年香港人睇廣東人搶板藍根咁。
//Dr David Carrington, of St George's, University of London, told BBC News "routine surgical masks for the public are not an effective protection against viruses or bacteria carried in the air", which was how "most viruses" were transmitted, because they were too loose, had no air filter and left the eyes exposed.
https://www.bbc.com/news/health-51205344
Face masks aren't a very effective way to prevent the spread of coronavirus, experts say, despite spiking sales
https://www.businessinsider.com/wuhan-coronavirus-face-masks-not-entirely-effective-2020-1
//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.//
https://edition.cnn.com/2020/01/28/health/coronavirus-us-masks-prevention-trnd/index.html
//If a face mask has an “N95” designation, that means that it will filter out 95% of particles as small as 0.3 microns from the air. The viruses in the coronavirus family are all quite large (at least by virus standards), and on average they are a little over 0.1 microns. So theoretically, even with an N95 mask some virus particles could still get through. It’s also important to note that N95 masks don’t work well for children or people with facial hair, and people who already have lung issues may find it harder to breathe when wearing one of these masks.
You might see people wearing surgical masks; those flimsy paper masks that hook behind the ears. Unfortunately, those masks are typically too loose to really be effective in stopping the virus. //
https://www.forbes.com/sites/leahrosenbaum/2020/01/29/should-you-get-a-face-mask-a-guide-to-coronavirus-face-protection/#659553f830a5