The body fluids of a person with AIDS may be contagious if the virus is still active when the body fluids leave the body. However, the saliva of an AIDS patient is generally not contagious to others. AIDS is a systemic disease caused by infection of the human body with HIV (Human Immunodeficiency Virus), which is contagious. HIV is transmitted through blood, semen, vaginal secretions, amniotic fluid, and other body fluids from infectious agents. When a person with AIDS leaves the body, the virus in his or her body fluids is still active and may infect others. In addition, the saliva of a person with AIDS is usually not contagious to others. If body fluids are small, dry up quickly and are in a dry, hot environment, the viral activity in them may be lost and they are not usually contagious. If you come into contact with the body fluids of a person with AIDS and are worried about contracting HIV, it is advisable to consult a doctor at a regular hospital to find out what to do.