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Abstract
A study of the prevalence of human onchocerciasis in eight villages around the Assob River in Jos Plateau, Nigeria, was undertaken between October 1983 and March 1985 using the skin-snip method. A total of 1673 individuals were examined. One hundred and eighty five (11·06%) had microfilariae of Onchocerca volvulus in their skin biopsies, and of these infected people, five (2·7%) were blind. The highest prevalence rate recorded was in Ngwan Madaki, where 51 (26·3%) of the 194 people examined were infected. The lowest percentage prevalence was recorded in Dogon Fili with four (1·95%) of the 205 people examined being positive. The proportion of infected people increased with age; and onchocercal lesions were significantly more common in older than in younger persons (P<0·05). There was no significant difference between infection rates in males and females (P>0·05), although the overall percentage infection and the numbers of onchocercal lesions were higher in males than in females.