This cross-sectional study includes all new patients consulting for the first time in the anti-venereal center of the National Institute of Public Health (NIPH) during the period of May to July 1997. Among them, 20.1% of the consulting patients and 31.3% of those suffering from STI were positive to HIV. The STI particularly those with ulceration are a risk factor in HIV transmission. This study points up the need of an adequate management of sexual transmitted diseases as a main strategy to struggle against HIV/AIDS infection.