nosocomial infection (Day 28), CD4+ T cell count by flow cytometry in two groups (baseline, Day, 3, 6, 10, 14, 21, 28) NCT04288102/Recruiting, May5‐Dec31 2020–2021 The clinical study of carrimycin on treatment patients with COVID‐19 Drug: carrimycin, drug: lopinavir/ritonavi