The causative agent of novel coronavirus pneumonia is a novel coronavirus, and the most reliable clinical method for confirming the diagnosis of novel coronavirus pneumonia is pathogenetic examination. In clinical practice, some patients have mild symptoms and some have more severe symptoms. In different types of patients, the diagnosis should be made in conjunction with the clinical manifestations. If the patient has a persistent fever, the most important condition is a history of exposure to an infected area or to a patient with novel coronavirus pneumonia. Novel coronavirus pneumonia is an infectious disease, and there must be a clear history of exposure for it to cause illness. Clinical symptoms should also be considered. The patient has fever, cough and progressive dyspnea, which are three very typical clinical signs. If the viral nucleic acid test is positive, this is the most direct evidence. Source: Dr. Yurai