Firstly, clinical manifestations of novel coronavirus pneumonia, such as fever, cough, and malaise, followed by routine blood work and lung CT at the hospital to determine if it is a suspected case. The conditions for a suspected case are epidemiological history and clinical manifestations. There are four conditions for epidemiological history: i. History of travel or residence in a moderate-to-high risk area within fourteen days before the onset of fever. Second, a history of contact with a person infected with the new coronavirus or a person who tested positive for nucleic acid within fourteen days before the onset of the disease. III. History of contact with patients with fever or respiratory symptoms from their own case reporting community within fourteen days prior to onset of illness. IV. Aggregate onset with three conditions of clinical presentation: 1. fever and or respiratory symptoms. 2. imaging features of novel coronavirus pneumonia. 3. normal or reduced total white blood cell count and reduced lymphocyte count early in the onset. Conditions for confirming a suspected case: 1. Any one of the epidemiological history, meeting any two of the clinical manifestations. 2. No definite epidemiological history. If three of the clinical manifestations are met, the diagnosis of suspected cases will be confirmed by nucleic acid testing or gene sequencing after diagnosis.