At the end of 2003, an estimated 1,039,000 to 1,185,000 persons in the United States were living with HIV/AIDS . . . In 2005, 38,096 cases of HIV/AIDS in adults, adolescents, and children were diagnosed in the 33 states with long-term, confidential name-based HIV reporting. . . CDC has estimated that approximately 40,000 persons in the United States become infected with HIV each year. . . By Transmission Category In 2005, the largest estimated proportion of HIV/AIDS diagnoses were for men who have sex with men (MSM), followed by adults and adolescents infected through heterosexual contact.