HIV IV test is a combined test of HIV-1 antibody plus HIV-2 antibody and P24 antigen. 14 days negative test can rule out the infection for the time being, and you can choose to retest after 1 month. It generally takes 2 to 6 weeks for HIV antibodies and p24 antigen to be detected in the blood after infection with HIV, and the period of time between infection with HIV and the production of antibodies by the human body, during which HIV antibodies and p24 antigen cannot be detected, is known as the window period. Therefore, a 14-day negative test can only rule out the possibility of HIV infection for the time being, and it is recommended that the test be repeated in 1 month to completely rule out the possibility of infection. HIV is generally transmitted through blood, sexual contact, and vertical transmission from mother to child. When the above suspected cases or high-risk sexual contacts occur, it is recommended to go to the local CDC unit in time to use anti-blocking drugs (such as tenofovir, emtricitabine, raltegravir, etc.), to avoid infection of the HIV virus, while daily life contacts such as shaking hands will not cause the virus to be infected.