Monitoring (4) Control (4) Onchocerciasis (4) Protection (4) Insecticides (3) Example (3) Afrique de l'Ouest (2) surveillance (2) programme (2) parasite (2) onchocercose (2) surveillance (2) insecticide (2) Afrique (2) Ouest (2) Development (2) Diseases (2) Protection (2) Simulium damnosum (2) Wrestling (2) Valleys (2) Rivers (2) Ribs (2) Public health (2) Ivory (2) Human ecology--Study and teaching (2) Fishes (2) Communal living (2) Collective settlements (2) Blindness (2)