关键： 医生说周四即有发烧。从感染到发烧应该在四天左右

https://blog.bcbsnc.com/2020/07/a-timeline-of-covid-19-symptoms/

https://www.bbc.com/news/health-52133054

https://foamcast.org/2020/03/26/covid-19-timeline-of-disease-and-viral-shedding/