Urinary and intestinal schistosomiasis in the Tono Irrigation Scheme, Kassena/Nankana District, upper east region, Ghana.

Human- and snail-related aspects of transmission of urinary and intestinal schistosomiasis were studied in the Tono Irrigation Scheme in northern Ghana. The scheme became operational in 1977. In some schools, prevalences and intensities of both Schistosoma mansoni and S.

Evaluation of focal mollusciciding in the Rahad Irrigation Scheme, Sudan.

Since the establishment of the Rahad Irrigation Scheme in 1979, the prevalence of schistosomiasis has increased to high levels in some villages despite the efforts of the Blue Nile Health Project to prevent this. Although a programme of focal snail control has been implemented since 1979, when the first intermediate host snails were detected, infected snails are abundant in human water contact near villages where transmission of both S. mansoni and S.