Between 1946 and 1948, the United States government under President Harry S. Truman in collaboration with Guatemalan President Juan José Arévalo and his health officials deliberately infected more than 1500 soldiers, prostitutes, prisoners and even mental patients with syphilis and other sexually transmitted diseases such as gonorrhea and chancroid (a bacterial sexual infection) out of more than 5500 Guatemalan people who participated in the experiments. The worst part of it is that none of the test subjects infected with the diseases ever gave informed consent. The Boston Globe published the discovery made by Medical historian and professor at Wellesley College, Susan M. Reverby in 2010 called ‘Wellesley professor unearths a horror: Syphilis experiments in Guatemala.’

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After Reverby’s discovery, the Obama administration apparently gave an apology to then-President Alvaro Colom according to the Boston Globe:

Yesterday, Obama called President Álvaro Colom Caballeros of Guatemala to apologize, and Obama’s spokesman told reporters the experiment was “tragic, and the United States by all means apologizes to all those who were impacted by this.

Secretary of State Hillary Rodham Clinton had called Colom Thursday night to break the news to him. In her conversation with the Guatemalan president, Clinton expressed “her personal outrage and deep regret that such reprehensible research could occur,’’ said Arturo Valenzuela, assistant secretary of state for Western Hemisphere affairs.

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Although they were treated with antibiotics, more than 83 people had died according to BBC news in 2011 following a statement issued by Dr Amy Gutmann, head of the Presidential Commission for the Study of Bioethical Issues:

The Commission said some 5,500 Guatemalans were involved in all the research that took place between 1946 and 1948. Of these, some 1,300 were deliberately infected with syphilis, gonorrhoea or another sexually transmitted disease, chancroid. And of that group only about 700 received some sort of treatment. According to documents the commission had studied, at least 83 of the 5,500 subjects had died by the end of 1953.

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However, the U.S. Department of Health and Human Services published the study ‘Fact Sheet on the 1946-1948 U.S. Public Health Service Sexually Transmitted Diseases (STD) Inoculation Study’ and was forced to admit what happened in Guatemala during the syphilis experiments:

While conducting historical research on the Tuskegee Study of Untreated Syphilis, Professor Susan Reverby of Wellesley College recently discovered the archived papers of the late Dr. John Cutler, a U.S. Public Health Service medical officer and a Tuskegee investigator. The papers described another unethical study supported by the U.S. government in which highly vulnerable populations in Guatemala were intentionally infected with sexually transmitted diseases (STDs). The study, conducted between 1946 and 1948, was done with the knowledge of Dr. Cutler’s superiors and was funded by a grant from the U.S. National Institutes of Health to the Pan American Sanitary Bureau (which became the Pan American Health Organization) to several Guatemalan government ministries. The study had never been published.

Then there's Dr. Cyril Broderick, A Liberian scientist and a former professor of Plant Pathology at the University of Liberia’s College of Agriculture and Forestry, who writes:

The US Department of Defense (DoD) is funding Ebola trials on humans, trials which started just weeks before the Ebola outbreak in Guinea and Sierra Leone. The reports continue and state that the DoD gave a contract worth $140 million dollars to Tekmira, a Canadian pharmaceutical company, to conduct Ebola research. This research work involved injecting and infusing healthy humans with the deadly Ebola virus. Hence, the DoD is listed as a collaborator in a “First in Human” Ebola clinical trial (NCT02041715, which started in January 2014 shortly before an Ebola epidemic was declared in West Africa in March.