The day after HIV infection, there is usually no clinical manifestation. HIV infection is a very complex process, and it takes time for HIV to enter the body and cause further infection of blood cells through a number of mechanisms. The clinical manifestations of HIV infection occur in about 2-4 weeks and are mainly characterized by symptoms of acute viral infection and acute damage to the body’s immune system. Patients may develop fever, along with generalized muscle and joint pain, fatigue, nausea, diarrhea, loss of appetite, and in some cases a rash in different parts of the body. Prevention of AIDS should be strengthened because AIDS is still a clinically intractable disease and most patients have a very poor prognosis and a high mortality rate.