GUATEMALA CITY – The United States carried out 17 different types of  medical experiments on approximately 1,500 Guatemalans by intentionally  infecting them with venereal diseases in the 1940s, Guatemalan Vice  President Rafael Espada told the press.
Officials already have  data on the medical projects and the information is being investigated  by a commission headed by the vice president with help from the United  States, Espada said.
The experiments were performed by U.S.  scientists on the mentally ill, prostitutes, prisoners and soldiers in  the Central American nation between 1946 and 1948, Espada said. The  Guatemalans were infected intentionally with syphilis and gonorrhea,  among other diseases.
The U.S. government has already provided  about 90 percent of the scientific information about the experiments and  the documents will be opened when the commission investigating the  matter is fully constituted with medical experts and translators to  avoid mistakes and misunderstandings, the vice president said.
Source 
U.S. scientists infected the mentally ill, prostitutes, prisoners and  soldiers with veneral diseases in the Central American nation between  1946 and 1948