After the human body is infected with HIV, at about 2 to 4 weeks, some of the patients will have acute phase symptoms of HIV. Similar to upper respiratory tract infection symptoms. There is also a part of the people do not have any abnormal phenomena. 1. Acute infection stage: symptoms caused by the HIV virus fighting against the body’s immunity. Clinical manifestations are fever, sore throat, enlarged lymph nodes, vomiting, diarrhea, muscle aches and pains, skin rashes and so on. Symptoms usually last about one to two weeks to return to normal, and then it will enter the incubation period. 2. Asymptomatic infection period: This is usually the case for carriers with strong body immunity. After high-risk sex, it is best to use the AIDS antibody test card to test at two weeks, four weeks, six weeks and three months. If all tests are negative, HIV infection can be ruled out.