effect of school based treatment on the prevalence of schistosomiasis in endemic area in yemen.

background: schistosomiasis and soil transmitted infection is a major health problem of children from rural areas of developing countries including yemen. in an attempt to reduce this burden, the ministry of public health and population in yemen established in 2002 a programme for schisto-somal, soil transmitted infection control that aimed to reduce morbidity and prevalence rates of schistosomiasis, and soil transmitted helminthes to less than 5% by 2015. the study was conducted to assess the current prevalence and intensity of schistosomal infection among schoolchildren in ru-ral areas of the taiz governorate after 6 years of running national control programme. methods: grade 3 schoolchildren from shara’b al-raona district of taiz governorate were ex-amined for infections with schistosoma mansoni using modified kato–katz method and s. haematobium applying filtration method in 1998/1999, comparing the prevalence and intensity of infection with base line study, which was done 6 years ago. results: the s. mansoni prevalence in the study population was 31%, while the prevalence of s. haematobium was 18.6%. this result considerably is similar to the prevalence of base line study. the intensity of mild, moderate and severe infection for s. mansoni reached to 15.9%, 60.6% & 23.5% re-spectively. the severity of s. haematobium infection was 68.4%. it was exceptionally found that the prevalence of s. haematobium is increased. conclusion: the high prevalence of schistosomiasis and low effectiveness of control programme against schistosomal infection in the study area demands consideration of alternative treatment ap-proaches.