哪有那么恐怖，病毒入血的轻症比例很小 （估计<10%)，住院的估计有30-40% (很多都是胖子和有基础病的）, icu里的可能更多。

The frequency of viral RNAemia was higher in the critically ill patients (78%) compared to ward patients (27%) and outpatients (2%) (p < 0.001). 

Comorbidities were frequent including obesity (37.6%), hypertension (30.6%), and diabetes mellitus (22.4%). 

还是要一直带口罩吧，即使不幸碰到了，口罩给过滤掉主要的，洗鼻子洗掉一些，再一点点掉到肺里，免疫系统跑过来杀死。要是不带口罩一口气吸入很多，那确实就有可能悲剧