Fig. 2.

Estimated distribution of S. mansoni in Uganda pre-2004 and in 2006. The pre-2004 data were collected from 201 schools and based on stool examination using the Kato-Katz method (Kabatereine et al. 2004). The 2006 data were collected from 429 schools in 31 districts across the country and based on a rapid mapping survey using LQAS technique (Brooker et al. 2005). Here, four teams, comprised of one supervisor, two technicians and a driver visited different regions of the country and sampled eight schools per day over 3 days per district. Geographical coordinates, using hand-held global positioning system (GPS) devices, were also recorded for each school which allowed, once all the data had been collected, the creation of prevalence maps using GIS software.