AIDS stands for Acquired Immune Deficiency Syndrome: AIDS is a virus HIV, human immunodeficiency virus. If you are infected with HIV, your body tries to fight the infection. Will be “antibodies,” special molecules to fight HIV. Many HIV-positive people, but not get sick for many years. HIV disease continues, slowly wearing the immune system. Viruses, parasites, fungi and bacteria, which usually causes no problems very sick if your immune system is damaged. The virus from one individual to another through the exchange of bodily fluids (eg blood or semen), attacks the white blood cells, so that the body loses its ability to ward off infections. As a result, many AIDS patients die of opportunistic infections that strike their debilitated bodies. » Read more: AIDS: Symptoms and Treatment of AIDS