HIV is a lent virus, which is a class of viruses that attack the immune system. Lent viruses are in turn part of a larger group of viruses known as retroviruses. The name 'lent virus' literally means 'slow virus' because they take such a long time to produce any adverse effects in the body.

Human behavior plays a key role in most of the disease condition in life. a) Socialization; is a life long process through which individuals in a society develop an awareness of social norms and values; achieve destine of self. b) Norms: Rules and expectations conduct which either prescribes a given type of behavior, or forbid it. c) Values: Culturally defined standards held by human individuals or groups about what are desirable, proper, beautiful, and good or bad that save as broad guidelines for social life. d) The individualistic interpretation of disease places emphasis on the individual as responsible for his or health status. Health compromising behavior by individual is the main factor in health.