AIDS, or acquired immune deficiency syndrome is the eleventh cause of death. the origin of AIDS is still controversial, In the United States, the disease was first appeared in male homosexuals. According to the Centers for Disease Control, the most common transmission of AIDS is through homosexual sex (52 percent). Other means of transmission are drug injection, 25 percent; heterosexual sex, 8 percent; homosexual sex and drug addiction, 7 percent; undetermined, 6 percent; and blood transfusions, 2 percent. The lengthy incubation period, sometimes lasting several years, contributes to its spread. While AIDS is the eleventh cause of death for the overall population, it is the leading cause of death for men age 24–44 in the United States.
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