The final diagnosis of novel coronavirus infection depends on the results of pathogenic testing. Because of the large number of infected individuals in various regions and the limited number of kits available, it is best to conduct viral pathogenic testing after a physician determines that an infected individual is suspected. For suspected cases, the epidemiological history and clinical manifestations need to be combined. For those who have a history of significant contact with the virus-infected or suspected virus-infected person 14 days before the onset of the disease, or those who have traveled, worked or lived in infected areas or other endemic areas with typical clinical manifestations, such as fever, malaise, dry cough, etc., the doctor will prescribe a chest CT (or X-ray) and routine blood tests. If the results of the two tests are consistent with viral pneumonia, the patient is a suspected infected person, and then a pathogenic test is arranged for the patient, and a positive result will confirm the diagnosis.