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Tuskegee Syphilis Study (1932-1972). An equally well known chapter in history occurred during a research project conducted by the U.S. Public Health Service. Six hundred low-income African-American males, 400 of whom were infected with syphilis, were monitored for 40 years. Free medical examinations were given; however, subjects were not told about their disease. Even though a proven cure (penicillin) became available in the 1950s, the study continued until 1972 with participants being denied treatment. In some cases, when subjects were diagnosed as having syphilis by other physicians, researchers intervened to prevent treatment. Many subjects died of syphilis during the study.
 

http://www.tuskegee.edu/Global/Story.asp?s=1207598