Novel Coronavirus Pneumonia is an infectious disease, the causative agent of which is a novel coronavirus. Novel Coronavirus Pneumonia is a newly discovered disease, and knowledge of the disease is still limited. As far as the current knowledge of the disease and the current clinical characteristics of the patient’s onset of illness are concerned, the patient in the acute phase or the patient with the onset of illness is definitely contagious. There is a period of incubation before the patient develops the disease, and the patient may or may not have symptoms during the incubation period. In the absence of symptoms, a significant proportion of patients can be found to be highly infectious. The infectious nature of the incubation period of novel coronavirus pneumonia is the reason why novel coronavirus pneumonia is so difficult to control. Source: Dr. Yurai