After the incubation period, a person with AIDS enters the AIDS phase, which can result in a variety of infections and even death. The AIDS stage is when the patient’s CD4 lymphocyte count drops significantly, with the majority being less than 200, and the viral load of HIV increases significantly. The patient’s immune system is close to collapse and the body has little or no resistance to outside pathogens. No matter what kind of pathogens are present, any contact with the patient can cause infection. Patients may experience persistent fever, night sweats, diarrhea, weight loss, and a variety of infections in various systems, causing organ or system failure, as well as secondary malignancies, Kaposi’s sarcoma, etc., which can eventually lead to death.