According to the fifth edition of the Pneumonia Treatment Protocol for Novel Coronavirus Infection, the incubation period for novel coronavirus pneumonia is 1-14 days, with the majority of patients having an average incubation period of 3-7 days, although its actual onset cannot be determined. The incubation period of the disease is long and jumpy, with an incubation period of about 7 days on average, but a small number of patients do not show obvious symptoms after 14 days, i.e., patients have been mildly or not obviously symptomatic infected persons. Therefore, the close contact medical observation period is set at 14 days, and if no corresponding clinical symptoms appear within 14 days, the risk of infection with the disease can be simply ruled out, but attention should also be paid to the existence of asymptomatic infected persons. Content source: Dr. You Lai