U.S. government medical researchers intentionally infected hundreds of people in Guatemala, including institutionalized mental patients, with gonorrhea and syphilis without their knowledge or permission more than 60 years ago. Many of those infected were encouraged to pass the infection onto others as part of the study. About one third of those who were infected never got adequate treatment... "The sexually transmitted disease inoculation study conducted from 1946-1948 in Guatemala was clearly unethical," according to the joint statement from Clinton and Sebelius. "Although these events occurred more than 64 years ago, we are outraged that such reprehensible research could have occurred under the guise of public health. We deeply regret that it happened, and we apologize to all the individuals who were affected by such abhorrent research practices." DETAILS:U.S. apologizes for STD experiments in Guatemala - Health - Sexual health - msnbc.com Story: Horrific medical tests of past raise concerns for today In addition to the apology, the U.S. is setting up commissions to ensure that human medical research conducted around the globe meets "rigorous ethical standards." U.S. officials are also launching investigations to uncover exactly what happened during the experiments.