The incubation period of novel coronavirus has been reported to be as short as 1 day and as long as 24 days. Based on current epidemiological surveys, the incubation period is 1-14 days, mostly 3-7 days, so close contact with novel coronavirus pneumonia has been used, and isolation is currently used for at least 14 days. Transmission of novel coronavirus pneumonia is via respiratory droplets and close contact, and the possibility of transmission via aerosols exists in relatively closed environments with prolonged exposure to high aerosol concentrations. Close contact is dangerous. After isolation from the patient, disinfect the patient’s living environment, and the contact person should take rest, drink more water, and ensure a balanced and protein-rich diet.