After the new crown has turned negative, it is usually necessary to isolate the patient for about 3 to 5 days to ensure that the disease will not recur before leaving the house. Turning negative does not necessarily mean that the patient is cured, because there is a certain possibility that the patient will relapse. The incubation period of the new coronavirus is usually around 1 to 14 days, with the average incubation period being around 3 to 7 days. Therefore, self-isolation for another 3 to 5 days after conversion can generally determine whether the new coronavirus remains in the body by observing whether the patient has symptoms or not and by conducting relevant examinations. During the self-isolation period, the room should be disinfected and ventilated daily, and no contact with outsiders should be made to avoid contagion. If symptoms such as fever, chest tightness, pneumonia, etc. appear after discharge from the hospital to avoid contagion and delay in treatment, consult a doctor immediately.