The goal of this observational study is to learn the long-term prognosis of patients and the clinical characteristics of complications, which is of great significance for treatment of novel coronavirus infection pneumonia. This trial plans to include 5700 inpatients with positive SARS CoV-2 nucleic acid test results. This trial does not involve the use of specific drug. Participants's health and psychological status will be observed at the preset time points. The blood, feces, urine samples of patients will be collected for relevant tests.