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Predicted snail habitat suitability in 1990 for three snail species. Bulinus globosus (a), Biomphalaria pfeifferi (b) and Lymnaea natalensis (c) with an overlay of prevalence survey schools (human schistosomiasis - map a and b) and dip tanks (veterinary fascioliasis - map c). ◯ no transmission (prevalence <5%), ● on-going transmission (prevalence >5%).
