Mapping of cholera risks using geographical information system in llala District, Tanzania

Abstract

Geographical Information System (GIS) was used to map cholera-epidemic prone areas and determine the predisposing factors of the disease in llala district, Tanzania. A database was developed to store all data (spatial and non-spatial) showing the source and spread of cholera. The results of this study indicate that Vingunguti, Kiwalani, Mchikichini, Kipawa and Buguruni areas had the highest cholera incidences. Few cases of cholera were reported in Kitunda, Kinyerezi and Ukonga. The disease is likely to spread at high rate in areas along the Msimbazi River Valley. Areas like Segerea and Tabata are likely to be more affected in future. Poor water supply, poor sanitation, and high population density were identified as cholera spatial elements within the district. The findings demonstrate the potential of GIS in monitoring sources and spread of a communicable disease such as cholera. Some of the reasons for the frequent cholera outbreaks in llala and other districts in Tanzania are discussed in relation to disease surveillance and control.