Diagnosis of HIV requires a comprehensive analysis of epidemiological history, including history of unsafe sex, history of intravenous syringe injection of drugs, importation of blood or blood products not tested for anti-HIV antibodies, history of childbirth or occupational exposure of HIV-positive persons, as well as clinical manifestations and laboratory tests, etc., to make a careful diagnosis. Adults, adolescents and children over 18 months of age with positive HIV antibody screening test and positive HIV antibody confirmation test, or positive HIV antibody screening test and HIV nucleic acid test, can be diagnosed with HIV infection. Children 18 months of age and younger who have an HIV-infected mother can receive HIV antibodies from their mother at birth, but they should usually disappear within 18 months. Infection cannot be determined by a positive HIV antibody until the antibody disappears, but can be determined by two positive HIV nucleic acid tests, with the second test to be performed 6 weeks after birth. There is a possibility of HIV infection due to exposure in daily work and life, which is called HIV exposure, including occupational exposure, sexual exposure, etc. Patients can seek HIV blocking medication at the CDC within 72 hours of exposure. If the blocking medication is taken within 72 hours, the spread of HIV will be effectively controlled. If preventive medication can be administered within 24 hours, the blockage rate is close to 100%. If you are already infected with HIV, you can suppress the virus with a combination of three or more anti-retroviral drugs, called HAART therapy. HAART therapy does not cure HIV infection, but it can suppress the replication of the virus in the body and strengthen the body’s immune system, restoring its ability to fight infection.