The diagnosis of novel coronavirus pneumonia is based on the following: 1. The epidemiological basis, infection with novel coronavirus is a prerequisite for novel coronavirus pneumonia. Infection with novel coronavirus needs to be combined with whether or not the patient has been to the infected area and whether or not there has been close contact with patients with novel coronavirus infection, which is a prerequisite for diagnosis; 2. The performance of the infected patient can be mild or severe, so the clinical presentation is complex and can be clinically manifested as mild, common, heavy or critical. The clinical manifestations can be mild, common, heavy or critical. Different types of manifestations are different, for example, the light type only shows coughing and sneezing similar to a cold, or slight fever. The common type may present with a cough, persistent fever, or progressive dyspnea. Severe and critical types may show increased respiratory distress, acute respiratory distress syndrome, liver damage, kidney damage and gas exchange failure, including bleeding and coagulation disorders, and in severe cases, death. If the nucleic acid test is positive, the diagnosis of novel coronavirus infection can be made even if the clinical symptoms are atypical or even absent. In addition, genome sequencing of the virus is also a more specific test. Content source: Dr. You Lai