The incubation period for novel coronaviruses is 1 to 14 days, but most are 3 to 7 days. The length of the incubation period after infection with the novel coronavirus varies depending on each person’s physical condition, body resistance and immunity, and the amount of virus infected. Most people have an incubation period of 3 to 7 days. In a few people, the incubation period may be relatively short, about 1 to 2 days. Other patients develop the disease within about 14 days of infection. Common symptoms of novel coronavirus infection include fever, malaise, dry cough, itchy nasal congestion in the throat, diarrhea, abnormal taste, and loss of smell. Some patients have no symptoms and are therefore referred to as asymptomatic infections. Therefore, the general quarantine period for persons in contact with newly crowned patients is 14 days, which can be extended if necessary. During the isolation period, at least two nucleic acid tests with an interval of 24 hours or more should be taken, and only when the nucleic acid test result is negative at the end of the isolation period can the centralized isolation be lifted and the home isolation be continued for 7 days. Specific isolation methods are subject to local policy.