Washington, Aug 30 (IANS/EFE): Medical experiments performed by US doctors to infect more than 1,000 Guatemalans with syphilis and gonorrhea in the late 1940s killed 83 of them, a presidential panel said Monday.

The investigation was spurred by revelations last year about misconduct in US Public Health Service-supported STD research in Guatemala in 1946-48.

A panel of the President's Commission for the Study of Bioethical Issues is holding a public meeting to discuss its findings on the Guatemala experiments.

Of the more than 1,300 people deliberately exposed to STDs, "we believe that there were 83 deaths", panel member Stephen Hauser said Monday.

He said the scientists conducting the study made a "clear and deliberate" effort to deceive the subjects of the experiments as well as the scientific community and the general public.

According to Hauser, approximately 5,500 people participated in the experiments. They were divided into two groups: those who were subjected to diagnostic studies and those who received intentional inoculations containing the pathogens.

Fewer than 700 of the people deliberately infected with STDs received "any type of treatment", according to the more than 125,000 documents analysed by the commission.

"The best thing we as Americans can do when faced with a dark chapter in our history is to bring it to light," said Amy Gutmann, chair of the Bioethics Commission and president of the University of Pennsylvania.

"We also have called on our sense and sensibility about bioethics and added a careful, unvarnished ethical analysis to the historical investigation. We do this to honour the victims and to make sure this never happens again," she said.

The US government apologised to Guatemala last year for the "abominable" experiments, which came to light 64 years after the fact thanks to research by Wellesley College medical historian Susan Reverby.