How long does it take for HIV to enter blood?

HIV can enter the bloodstream almost immediately after exposure, as the virus is present in bodily fluids such as blood, semen, vaginal fluids, and breast milk. Once it enters the body, it can begin to replicate within a few days, although it may take several weeks for detectable antibodies to appear in the blood. The time frame for clinical symptoms to manifest varies, but acute HIV infection typically occurs within 2 to 4 weeks after exposure.