New crowns can usually be ruled out after 14 days of isolation and two nucleic acid tests, both of which come back positive. Currently, people suspected to be infected with New Crown virus need to be isolated for 14 days, which is related to the incubation period of New Crown virus. In addition, although the incubation period of the virus does not usually cause clinical symptoms, it is still highly contagious and will cause the patient to develop the disease about 7 days after infection with the virus. There are also asymptomatic patients who do not show clinical signs, but are still infectious. Therefore, all patients at risk of infection need to be isolated for 14 days until two or more negative nucleic acid tests have been performed to rule out neocoronavirus. New Coronavirus is also contagious during the incubation period, and during the isolation period you need to actively cooperate with the relevant units to do a variety of care work.