Experimental:
Yinhu Qingwen granula group:
Drug: Yinhu Qingwen Granula
Yinhu Qingwen granula is a kind of herbal granula made from “Yinhu Qingwen Decoction,” which consits of 11 Chinese herbal medicine as honeysuckle, Polygonum cuspidatum, schizonepeta, Longspur epimedium, etc. The granula will be dissolved into 600 ml decoction and divided to three times (once with 200 ml). It will be given a 200 ml per time, three times a day, for 10 days.
Other: standard medical treatment Standard medical treatment is adhered to the protocol of the treatment for the severe CoVID‐19 according to the guideline approved by National Health Commission of China.
Placebo comparator: Yinhu Qingwen granula low‐dose group:
Drug: Yin Hu Qing Wen granula (low does). This intervention is given as 10% dose of YinHu QingWen Granula.The granula will be dissolved into 600 ml decoction and divided to three times (once with 200 ml).
Other: standard medical treatment Standard medical treatment is adhered to the protocol of the treatment for the severe CoVID‐19 according to the guideline approved by National Health Commission of China.