----------- 相关文献： 英国公共卫生部：Coronaviruses can be spread when people with the virus have close, sustained contact with people who are not infected. This typically means spending more than 15 minutes within two metres of an infected person, such as talking to someone for instance. https://publichealthmatters.blog.gov.uk/2020/03/04/coronavirus-covid-19-what-is-social-distancing/ 避免密切接触，是不被感染的关键： 张宏文 “我们发现，所有的感染都是密切接触传播开来的。” https://news.sina.com.cn/c/2020-03-25/doc-iimxyqwa3142295.shtml 病人呼吸，呼出病毒数量 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2442192/https://www.newscientist.com/article/2238819-does-a-high-viral-load-or-infectious-dose-make-covid-19-worse/
回复 19楼floridapalmtree的帖子 这是个模拟，与实际也许不同，但是起控下防范作用。一些评论： "Our risk of acquiring it and getting enough of that virus aerosol is completely unknown," said Dr. Kumi Smith, an assistant professor of epidemiology and community health at the University of Minnesota. The video "gives the impression that any shared airspace will lead to transmission," but evidence has yet to support that, Smith said. The larger risk with the coronavirus, according to Smith, is in closer contact with people, such as conversations, where larger droplets from talking, sneezing, or coughing can be transmitted. Those interactions, usually within three feet, could spread "an infectious dose." Dr. William Schaffner, a professor of preventative medicine and infectious diseases at Vanderbilt University Medical Center, agrees. "In the real world, droplet transmission within three to six feet accounts for vast majority of transmissions," Schaffner said. "Airborne" particles go farther and stay in the air for longer, but transmission from those smaller droplets "probably doesn't happen very often," he said. Both experts noted there's little evidence yet about how the coronavirus could spread through the air, but that the model shows the importance of practicing social distancing and precautions like wearing masks.
病人呼吸造成的感染，呼出病毒的数量大约在每8秒/升的呼吸，呼出1000个病毒，因此即使与病人暂短接触，保持足够距离也不会被感染。
可见，保持距离，减少接触时间，是不被感染的关键。
在超市，当你与病人保持两米以上距离，又戴着口罩，在病人呼气附近停留时间又很短，被感染的可能性几乎就消除了。
----------- 相关文献： 英国公共卫生部：Coronaviruses can be spread when people with the virus have close, sustained contact with people who are not infected. This typically means spending more than 15 minutes within two metres of an infected person, such as talking to someone for instance. https://publichealthmatters.blog.gov.uk/2020/03/04/coronavirus-covid-19-what-is-social-distancing/
避免密切接触，是不被感染的关键： 张宏文 “我们发现，所有的感染都是密切接触传播开来的。” https://news.sina.com.cn/c/2020-03-25/doc-iimxyqwa3142295.shtml
病人呼吸，呼出病毒数量 https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2442192/ https://www.newscientist.com/article/2238819-does-a-high-viral-load-or-infectious-dose-make-covid-19-worse/
社会每天都有很多新增病例，没有证据表明超市工作人员比其它非WFH的人群感染率高。比如，感染途径可能在公交车等处。
感染的途径是吸入，主要是鼻子吸入，吃饭时距离近，有很大的吸入可能，近距离交谈也有较大可能。
觉得这个靠谱
你说的是这个模拟吧，咳嗽二分钟后，隔壁aisle病毒消失。所以距离和时间很重要
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https://www.youtube.com/embed/vv9JQ0iPfgE
对是这个，拼基因拼运气