| distribution and severity of onchocerciasis in southern benin, ghana and togo. | the onchocerciasis control programme in west africa has recently extended its operation in southern benin, ghana and togo. to estimate the number of people infected and blinded by onchocerciasis and to describe the distribution and severity of the disease in the extension area, 99 villages were selected, using a stratified random sampling procedure, and surveyed. all the ecological and entomological information available was used in the sampling procedure and in the selection of 87 non-represent ... | 1992 | 1363185 |