The acquired immunodeficiency syndrome: epidemiology and risk factors for transmission.

The acquired immunodeficiency syndromE (AIDS) is a very serious illness caused by a human T-lymphotropic retrovirus: human T-lymphotropic virus type III/lymphadenopathy-associated virus (HTLV-III/LAV). It primarily affects young adults living in one of several major metropolitan areas. Most patients are homosexual men, but heterosexual men and women have also been affected. Heterosexual men and women who use intravenous drugs, who are hemophiliacs, or who are sex partners of AIDS patients appear to be at increased risk for developing the disease.