事实根据基础来源:
https://science.sciencemag.org/content/early/2020/03/13/science.abb3221
作者用了一个数学模型
资料来源是375个中国城市
得到的结论是在限制旅游前：
在1/23限制旅游前，有82~90%的感染者没被追踪到，这些大多是轻症
大约有79%的被追踪到的确诊者，是被无症状者感染(感谢antonis)
这段比较难搞懂：
Per person, the transmission rate of undocumented infections was 55%
of documented infections ([46%–62%]), yet, due to their greater numbers,
undocumented infections were the infection source for 79%
of documented cases.
模型从感染到确诊大约是9天(用线性资料估算则是6.6天)
如果真的要在没有疫苗/或特效药前终止疫情
看来手段要很严厉?