Patients with re-positive status can still spread the disease, so patients with re-positive status need to be isolated and treated to avoid the spread of the disease. In many infectious diseases, although the patient can recover after treatment, there is also a certain chance of re-positive phenomenon, which may be triggered by a second infection, but the incidence of such a situation is relatively low. It may also be due to the fact that the virus has not been completely eliminated even though the patient has recovered after clinical treatment. In either case, the patient’s re-positive status indicates that the infectious virus has reappeared in the patient’s body, so it can still be transmitted and cause others to become ill, and the patient will need to be treated again, and will become negative once the virus has been completely cleared. Most infectious diseases have the possibility of re-positive, although the human body after infection with the virus will form a memory to produce relevant antibodies, but due to the instability of the structure of the virus, the chances of mutation is very high, once the virus mutation will form a secondary infection, resulting in the emergence of patients with re-positive. Therefore, we should do a good job in our daily lives to take protective measures, appropriate sports and exercise, improve the body’s immunity, reduce the chances of infection and re-positive.