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Background   Schistosoma mansoni  and soil-transmitted helminths (STH) are among the most prevalent and highly neglected tropical diseases in Tanzania. However, little is known on the distribution of these infections in rural settings, especially in the island areas on Lake Victoria. Identifying the local risk factors of  S. mansoni  and soil-transmitted helminths is one step towards understanding their transmission patterns and will facilitate the design of cost-effective intervention measures. The present study was therefore conducted to determine the prevalence, intensity of infection and risk factors associated with  S. mansoni  and soil-transmitted helminth infections among school children in Ukara Island.    Methods  This was a cross sectional study which enrolled 774 school children aged 4-15 years in 5 primary schools in Ukara Island, North-Western Tanzania. Single stool samples were collected, processed using the Kato Katz technique and examined for eggs of  S. mansoni  and geohelminths under a light microscope. A pre-tested questionnaire was used to collect socio-demographic information.    Results  Overall, 494/773 (63.91%, 95% CI; 45.19-90.36) of the study participants were infected with  S. mansoni  and the overall geometrical mean eggs per gram (GM-epg) of feaces were 323.41epg (95% CI: 281.09 – 372.11). The overall prevalence of soil-transmitted helminth (STH) was 6.73% (n = 52/773, 95% CI = 4.39 – 10.32) with the most prevalent species being hookworms, 5.69% (n = 44/773, 95% CI; 3.68 – 8.79). Location of school in the study villages ( P <  0.0001), parent occupation, fishing ( P <  0.03) and reported involvement in fishing activities ( P <  0.048) remained significantly associated with the prevalence and intensity of  S.mansoni  infection.    Conclusion   Schistosoma mansoni  infection is highly prevalent in the islands whereas the prevalence of soil-transmitted helminths is low. The risk of infection with  S. mansoni  and the intensity of infection increased along the shorelines of Lake Victoria. These findings call for the need to urgently implement integrated control interventions, starting with targeted mass drug administration.    Electronic supplementary material  The online version of this article (doi:10.1186/s13071-014-0612-5) contains supplementary material, which is available to authorized users.

parasites and vectors

Intestinal schistosomiasis and geohelminths of Ukara Island, North-Western Tanzania: prevalence, intensity of infection and associated risk factors among school children