An investigation by Guatemalan authorities has identified about 1,300 people who may have been involved in a 1940s U.S. syphilis experiment, and says a few may still be living.
Vice President Rafael Espada says a search of hospital, health department, military and prison records has identified about 1,300 men who were infected with syphilis or gonorrhea without their knowledge or consent.
Espada says "three or four" of those involved in the study may still be living.
Espada said Wednesday that about 10 American and 12 Guatemalan doctors were involved in the two-year study.
The study involved seeing how differing dosages of penicillin worked against different venereal diseases.