a team of scientists from the United States, France, China and Hong Kong were able to calculate what's called the serial interval of the virus. To measure serial interval, scientists look at the time it takes for symptoms to appear in two people with the virus: the person who infects another, and the infected second person.
https://www.eurekalert.org/pub_releases/2020-03/uota-csq031320.php
所以即使能大规模检测，要防疫的话social distancing是必须的。
无症状，说明不咳嗽。这病毒怎么传出来的？莫非呼出的气里就有病毒？那就太可怕了。
不要说这次新冠，其它类型的流感也同样存在无症状带病毒性传播，只是因本身抗病能力强，未到足以发病程度而已。换言之，病毒侵犯这部分人身体后，体内宿主环境不具备病毒大幅度复制增殖环境。
这类人可传播，但从本身带病毒的量和浓度，传播能力而言，远不及已发病的和重症的人。
结果40%感染。
这正是这种病的可怕之处。
也许是拿食物的手。
人与人之间，保持至少6英尺距离
a team of scientists from the United States, France, China and Hong Kong were able to calculate what's called the serial interval of the virus. To measure serial interval, scientists look at the time it takes for symptoms to appear in two people with the virus: the person who infects another, and the infected second person.
看名字，所有的都是华人，