1. Adult aged >= 18 years old, 2. Patients with unexplained viral pneumonia that have been clinically diagnosed or patients with novel coronavirus serum antibody (IgM or IgG) positive or patients with novel coronavirus infection confirmed by PCR when no rapid diagnostic kit has been developed, 3. The interval between the onset of symptoms and randomized is within 7 days. The onset of symptoms is mainly based on fever. If there is no fever, cough or other related symptoms can be used,

1. Adult aged >= 18 years old, 2. Patients with unexplained viral pneumonia that have been clinically diagnosed or patients with novel coronavirus serum antibody (IgM or IgG) positive or patients with novel coronavirus infection confirmed by PCR when no rapid diagnostic kit has been developed, 3. The interval between the onset of symptoms and randomized is within 7 days. The onset of symptoms is mainly based on fever. If there is no fever, cough or other related symptoms can be used,