A secondary asymptomatic infection is one that is acquired on the basis of other illnesses but has no obvious clinical symptoms. A secondary infection is a new viral or bacterial infection on top of an infection from another disease, not just this initial viral infection. An asymptomatic infection is one in which the patient has been infected by a new virus or bacteria, which has been clearly diagnosed through various tests, but the infection is not serious and does not cause obvious clinical symptoms for the patient. Therefore, once a person is diagnosed with secondary asymptomatic infection, he/she needs to pay attention to it, and it is best to have regular follow-ups to dynamically observe the changes in his/her condition, and at the same time take good personal precautions to prevent the spread of the disease.