ABSTRACT
A group of 52 villagers was followed-up for three years regarding Schistosoma mansoni infection. All villagers were periodically surveyed by the Kato-Katz method. In March 1997 and March 1998 the positives were treated with oxamniquine (15-20 mg/kg), and in March 1999, with praziquantel (60 mg/kg). All infection indices decreased substantially between March 1999 and March 2000: prevalence of infection (from 32.7 percent to 21.2 percent), prevalence of moderate/heavy infection (from 7.7 percent to 1.9 percent), intensity of infection (from 23.1 epg to 7.4 epg) and reinfection (from 35.7 percent to 14.3 percent). Negativation increased from 53.8 to 82.4. An optimistic prognostic is assumed in the short term for the introduction of praziquantel in the study area