AIDS infection can not be judged by the symptoms, can not detect AIDS antibody means no infection or in the window period of infection, 2-6 weeks after high-risk antibody is negative, basically can rule out infection. 1. No infection: fever, headache, muscle pain and other symptoms after high-risk behavior are not necessarily caused by AIDS, but may also be caused by colds or other systemic diseases. If you are not infected with AIDS, the antibody test will be negative. 2. In the window period of infection: According to the current antibody test method, the window period is about 2-6 weeks, but there are individual differences. If you are infected with HIV but in the window period, the antibody test result will be negative. It is recommended that the test be repeated after the window period. To summarize, the absence of antibodies means that the patient is not infected or is in the window period. It is recommended that the patient be retested after the window period to confirm the diagnosis and, if necessary, to provide reasonable treatment.