Patients
From Feb 12, 2020 to Feb 18, 2020, 69 patients from Xiangyang Central Hospital (31 with SARS-CoV-2-positive Pneumonia and 38 with common Pneumonia) were retrospectively selected. The positive samples were taken from COVID-19 patients diagnosed according to the Diagnosis and Treatment Plan of COVID-19 (7th trial edition) of the National Health, and the negative samples were from the common pneumonia patients with negative nucleic acid diagnosis. All patient or their families signed the informed consent. Subjects meet­ing the following conditions were excluded from this study: 1) pregnant and lactating women and 2) those with diseases that may affect the efficacy or safety evaluation of this study (hematologic cancer, systemic lupus erythematosus, and rheu­matoid arthritis).