The incubation period is the period from the time when the causative stimulus invades or acts on the organism to the time when the organism reacts or starts to show symptoms during the development of the disease. The average incubation period of novel coronavirus is about 7 days, and the longest incubation period is 24 days. During the incubation period of novel coronavirus pneumonia, there are usually no serious symptoms associated with the disease. As the disease progresses, however, different symptoms may manifest as immunity varies from person to person. Some patients only have symptoms of low-grade fever and physical weakness, and can recover spontaneously after about a week; some patients may develop a series of symptoms such as dry cough, high fever, and pneumonia. In addition, the novel coronavirus is also contagious during the incubation period, so special attention should be paid.