The epidemiology of onchocerciasis in the Tukuyu Valley, South West Tanzania.

In the Tukuyu valley in Tanzania 21 villages were surveyed and 2,043 people were examined. In total village populations aged 1 year and over, the highest prevalence of 62.8% (49/78) was found near the Lufilyo River, corresponding to the highest transmission potential. Villages with higher endemicity were not found and there was no difference in blindness rates between villages with little or onchocerciasis and those with mesoendemic onchocerciasis.