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A study was conducted to test the application of the so called "indirect questionnaire approach" using key informants, for the assessment of high risk areas for onchocerciasis. The objective was to determine the validity, cost-effectiveness and operational feasibility of questionnaires. Questionnaires were designed and distributed to six junior high schools via the education officer and administered to 1385 students through their teachers. Validation test was undertaken on 1345 students of thedoi:10.20372/nadre/13914 fatcat:szeb3kagtrgo3azcij4hxlquae