The incubation period of novel coronavirus pneumonia is 1-14 days. Symptoms may occur within 1-14 days after contact with a person infected with novel coronavirus, generally averaging 3-7 days, with a peak at 4 days. There are also some patients who have not developed the disease during the incubation period after contact with a patient with novel coronavirus, but the nucleic acid detection test is still positive. These patients are also called asymptomatic infected patients and are also infectious, so as long as the incubation period patients must be isolated and observed. Those who develop symptoms should be given isolation observation and active treatment. Patients who are asymptomatic during the incubation period should also be monitored for temperature and nucleic acid testing until the incubation period is full and the nucleic acid test is negative before the isolation can be lifted.