Asymptomatic infected patients are those who are infected with the new crown virus but do not have obvious characteristic changes in lung imaging and clinical manifestations, which do not meet the criteria for being recognized as a confirmed case, and therefore are not considered confirmed cases. Confirmed cases are those who have positive nucleic acid test for Neocoronavirus or those who have not received Neocoronavirus vaccine are positive for Neocoronavirus specific IgM and IgG antibodies, and have clinical manifestations such as cough, fever, malaise, or specific changes in lung imaging. Asymptomatic infections are only pathogenetically or serologically positive, so they are not considered confirmed cases. Although asymptomatic infected persons do not have any clinical symptoms, they are also contagious and may be in the incubation period, so they need to be isolated and placed under medical observation in accordance with the national epidemic prevention and control measures until the nucleic acid test of the new coronavirus becomes negative.