1. Patients aged 15-80 years,diagnosed with mild, common, and severe novel coronavirus pneumonia in accordance with the diagnostic criteria for the diagnosis and treatment of novel coronavirus pneumonia issued by the National Health Commission (trial version 5), 2. White blood cell Count < 15.0 x 10^9/L and Lymphocyte Count < 0.8 x10^9/L.

1. Patients aged 15-80 years,diagnosed with mild, common, and severe novel coronavirus pneumonia in accordance with the diagnostic criteria for the diagnosis and treatment of novel coronavirus pneumonia issued by the National Health Commission (trial version 5), 2. White blood cell Count < 15.0 x 10^9/L and Lymphocyte Count < 0.8 x10^9/L.