Fig. 1.

The distribution of schistosomiasis in East and Southern Africa based on current progress in updating the Global Atlas of Human Helminth Infection (for further details see Brooker et al. 2000). The data included 2,498 survey locations reporting either S. mansoni or S. haematobium, and the highest prevalence of either species is presented. Information is based on electronic searches of formal literature and grey literature databases, as well as using personal contacts with schistosomiasis research scientists and control personnel. In the searches strict inclusion criteria are employed: only random or complete community-sample surveys conducted post-1980, where parasite species and age groups are defined. Surveys are geopositioned using Microsoft Encarta encyclopaedia and electronic gazetteer sources along with personal communication with authors.