The difference between patients with confirmed NCC and asymptomatic patients is that asymptomatic patients do not have clinical symptoms of NCC pneumonia, i.e., they do not have the typical symptoms of NCC pneumonia such as fever, dry cough, sore throat, or loss of smell, and they do not see the typical ground glass changes of NCC pneumonia on chest CT, and the only basis for determining their NCC infection is a positive nucleic acid test. The diagnosis of neostriatal pneumonia requires clinical support, so this group of infected patients is classified as asymptomatic infected patients. A confirmed case of neostriatal pneumonia is a patient who has a positive nucleic acid test, or who has a positive serum antibody on a blood test in a non-vaccinated person, and who has typical clinical manifestations of neostriatal pneumonia, such as fever, dry cough, sore throat, and decreased sense of smell, or who is supported by a CT imaging diagnosis. Asymptomatic infected patients may develop clinical symptoms and progress to a confirmed case, or they may remain asymptomatic and be called recessive infected patients. However, both confirmed cases of New Coronavirus and asymptomatic infected patients are infectious and can transmit the New Coronavirus to the general population, so both need to be isolated and treated. Therefore, when there is a confirmed case, people with a history of contact are required to do nucleic acid testing to rule out the possibility of being an asymptomatic infected person, and the infection of New Coronavirus can only be ruled out if there is an interval of more than 24 hours and the results of both nucleic acid tests are negative. Only by strictly controlling the source of infection can we avoid the flow of virus to healthy people.