Wuhan pneumonia, the so-called novel coronavirus pneumonia, is now considered to have an incubation period range of 2-14 days through the observation of pre-patients, with a possible 2-day onset in short cases and a possible 14-day onset in long cases, with most people concentrated in 3-7 days. The incubation period of novel coronavirus pneumonia is similar to that of most respiratory viral infections, such as influenza and colds where the incubation period may range from 2-7 days, while the incubation period of novel coronavirus pneumonia is 3-7 days in most patients. When a patient with novel coronavirus pneumonia is exposed, the risk of being infected can be ruled out if he or she remains asymptomatic after 14 days. Therefore, isolation for 14 days is recommended for some close contacts in units and households where a confirmed infected person is found, as the incubation period is up to 14 days. There are individual reports in the literature that the incubation period of individual patients exceeds 14 days due to individual physical reasons or other epidemiological investigation reasons, but in actual clinical work 14 days is considered to be the maximum incubation period. Content source: Dr. Yurai