1. Aged >= 18 years and <= 75 years, 2. Patients clinically diagnosed as novel coronavirus infection, or with positive serum antibodies (IgM or IgG), or with novel coronavirus infection confirmed by PCR, 3. Severe/critical patients.

1. Aged >= 18 years and <= 75 years, 2. Patients clinically diagnosed as novel coronavirus infection, or with positive serum antibodies (IgM or IgG), or with novel coronavirus infection confirmed by PCR, 3. Severe/critical patients.