When the human body is infected with HIV, there are no obvious signs and symptoms for a long period of time, so it is impossible to confirm the infection from self-perception and appearance. However, after infection, the body produces antibodies to the HIV virus, which do not protect the body and only indicate that the body is infected with HIV. Whoever wants to know if he or she is infected with HIV must go to an HIV testing facility to have a blood test to check for HIV antibodies in the blood. Only a positive confirmatory test result will diagnose HIV infection.