If you have had high-risk sex and tested negative for HIV antibodies after 6 months, you can basically rule out the possibility of HIV infection caused by this sex act, and if you are worried about missing the test, you can repeat the test. AIDS is caused by human immunodeficiency virus infection, when the body is infected by the virus, does not immediately produce the appropriate antibodies, generally 14 days after high-risk sexual behavior began to produce antibodies, most of the patients in 4 weeks after the production of sufficient antibodies. Therefore, after the occurrence of high-risk sexual behavior, generally in about 4 weeks can be detected antibodies to AIDS, if the results of 4 weeks negative, can be tested again in 8 or 12 weeks, in 12 weeks without the premise of high-risk sexual behavior again, if still not detected antibodies to AIDS, can basically rule out HIV infection. Therefore, if the HIV antibody test is negative after 6 months of high-risk behavior, the possibility of HIV infection caused by this sexual activity can be basically ruled out. If you are worried about missing the test, you can repeat the test. AIDS can cause serious defects in the cellular immune system of the body, which can lead to a variety of persistent infections, malignant tumors, and cause fatal damage to various systems of the body. It is recommended that people with multiple sexual partners, HIV-infected sex partners, sharing of needles for drug use and other high-risk sexual behaviors should go to the hospital in time for screening, so that early detection and treatment can prolong survival time and reduce complications.