The Epidemiology and cost of treating Diarrhoea in South Africa. Volume 1: Prevalence of Diarrheagenic pathogens in water sources in the Vhembe District of the Limpopo Province. The Epidemiology and cost of treating Diarrhoea in South Africa. Volume 1: Prevalence of Diarrheagenic pathogens in water sources in the Vhembe District of the Limpopo Province. Posted in .