Whether the incubation period of Neocoronavirus can be definitively detected is in the process of continuous exploration. After infection with the New Crown Virus, if the body’s resistance is strong, the body’s autoimmune cells can destroy the New Crown Virus, so that the concentration is reduced. If the body is infected with the virus, the autoimmune function is low or the immune function is relatively poor, not able to destroy the virus, the virus can continue to proliferate in the body. New coronavirus positive and negative are artificial values, sputum culture or secretion nucleic acid test or molecular testing, can be amplified by PCR nucleic acid concentration, that is, the size of the concentration with the body is constantly changing. Some patients suspect that they are latent because of a history of exposure or an infection in the surrounding home, and the test may be negative several times; others may present with symptoms of lung infection. Others may test negative 7-8 times but end up considering a new coronavirus infection because of similar symptoms. The diagnosis of neocoronavirus infection is made through a combination of dynamic observation, nucleic acid PCR testing, molecular biology or fluorescence testing, clinical signs and symptoms, and laboratory tests. If laboratory concentrations are low, follow-up is required to reach the correct conclusion. Source: Dr. Yurai