The development process of the new coronavirus takes about 1~21 days, and there are individual differences in the exact time, so it is not possible to generalize. New coronavirus infected people from infection to the onset of the disease, generally within 14 days, in 3 ~ 7 days the onset of the disease is a peak period, the majority of patients in 3 ~ 7 days will appear fever, dry cough, fatigue or upper respiratory tract infection symptoms, but also a small number of diarrhea as the first symptom. However, the specific situation of different people is different, there are also incubation period of 21 days, or from infection to cure is always asymptomatic infected people. It depends on the number and virulence of the new coronavirus, and the resistance of the infected person’s body. If the number of viruses is large enough and the virulence is very strong, it is likely that the disease will start within one day. The mainstay of treatment is symptomatic supportive care to maintain normal immune function. If the patient develops suspected symptoms, a novel coronavirus nucleic acid test should be performed as soon as possible.