Experimental: favipiravir combined with tocilizumab group
Favipiravir: On the 1st day, 1,600 mg each time, twice a day; from the 2nd to the 7th day, 600 mg each time, twice a day. Oral administration, the maximum number of days taken is not more than 7 days.
Tocilizumab: the first dose is 4–8 mg/kg and the recommended dose is 400 mg. For fever patients, an additional application (the same dose as before) is given if there is still fever within 24 hr after the first dose and the interval between two medications ≥12 hr. Intravenous infusion. The maximum of cumulative number is two, and the maximum single dose does not exceed 800 mg
Active comparator: favipiravir group
On the 1st day, 1,600 mg each time, twice a day; from the 2nd to the 7th day, 600 mg each time, twice a day. Oral administration, the maximum number of days taken is not more than 7 days
Active comparator: tocilizumab group
The first dose is 4–8 mg/kg and the recommended dose is 400 mg. For fever patients, an additional application (the same dose as before) is given if there is still fever within 24 hr after the first dose and the interval between two medications ≥12 hr. Intravenous infusion, The maximum of cumulative number is two, and the maximum single dose does not exceed 800 mg