Why did HIV turn positive after 158 days?

It is a relatively special and rare situation for AIDS to seroconvert in 158 days.

If AIDS seroconverts at 158 days, it may be during the window period when the patient has already been infected with the HIV virus, but the immune system has not yet produced sufficient antibodies or the antibody concentration is still too low, leading to a possible negative test result. As time progresses, antibodies gradually develop and increase in concentration, eventually resulting in a positive test result at day 158.

This scenario indicates that the patient has been infected with HIV and should visit a disease control center for confirmation, and receive appropriate treatment under the guidance of a qualified physician. Treatment for AIDS mainly includes antiviral therapy, immune modulation therapy, psychological support, and prevention and management of complications.