Clinical manifestations of novel coronavirus pneumonia: a. Fever, malaise, and dry cough are the main manifestations. Chest imaging shows multiple small patchy shadows and interstitial changes in the early stage, which are obvious in the outer lung zone, and then develop into multiple ground glass shadows and infiltrative shadows in both lungs, and in severe cases, solid lung lesions may appear, and pleural effusion is rare. Early onset of the disease, the total white blood cell count is normal or decreased, and the lymphocyte count is decreased. A suspected case can be diagnosed with 2 of the above symptoms and a history of residence or travel in Wuhan within 14 days of onset, or a history of contact with a suspected or confirmed case. The diagnosis of novel coronavirus pneumonia can be confirmed if the suspected case has one of the following pathogenic evidence: 1) positive nucleic acid test for novel coronavirus in respiratory specimen or blood specimen by fluorescent RT-PCR; 2) viral gene sequencing of respiratory specimen or blood specimen, which is highly homologous with known novel coronavirus.