Novel coronavirus pneumonia is an infectious disease, and infectious diseases have a certain incubation period. The incubation period means that there are no symptoms, no fever, no cough, the incubation period is as short as 2-3 days, and as long as 10-12 days, the average time is 7 days. Whether or not the disease can be detected during the incubation period can be confirmed by nucleic acid testing. If the test is positive, a novel coronavirus infection is suspected. Compared with the previous SARS, the incubation period of novel coronavirus pneumonia is longer, but the symptoms are relatively mild. SARS is characterized by a short incubation period and a large number of seriously ill patients, and according to the previous statistics, the mortality rate of SARS is close to 10%, whereas the mortality rate of novel coronavirus pneumonia is not high in the official data reported, so novel coronavirus pneumonia shows a very clear characteristic of infectious diseases, i.e., high infectiousness and low pathogenicity. Pathogenicity. Currently, the infectious capacity is seen to be around 1:2.2, i.e., one person infects about 2-3 people. Source: Dr. Yurai