The time from infection to onset of novel coronavirus pneumonia varies greatly depending on the physical status and underlying disease of each individual, with the clinical incubation period being from infection to onset. From the current clinical data, the clinical incubation period can be as short as one day or as long as two weeks. So typically, cases suspected of being infected will be advised to require isolation for at least two weeks. With the continuous understanding of the disease treatment process, it was found that the epidemiology of some patients is characterized by the absence of a history of outside contact for more than twenty days, but they can also develop the disease, so it is presumed that the incubation period of individual cases can be about 20 days. Content source: Dr. Ararai