1. Aged 18-80 years, 2. Within 1 week of onset, 3. Meet the diagnostic criteria of common, severe and critical NCP, according to Pneumonitis Diagnosis and Treatment Scheme for Novel Coronavirus Pneumonia (Trial Version 6) . 4. Sign informed consent.

1. Aged 18-80 years, 2. Within 1 week of onset, 3. Meet the diagnostic criteria of common, severe and critical NCP, according to Pneumonitis Diagnosis and Treatment Scheme for Novel Coronavirus Pneumonia (Trial Version 6) . 4. Sign informed consent.