Control (3) Onchocerciasis (3) Example (3) Protection (3) surveillance (2) programme (2) parasite (2) onchocercose (2) insecticide (2) poisson (2) Monitoring (2) Development (2) Onchocerca volvulus (2) Protection (2) Simulium damnosum (2) Valleys (2) Rivers (2) Public health (2) Human ecology--Study and teaching (2) Fishes (2) Afrique de l'Ouest (1) biomasse (1) toxicologie (1) science (1) santé publique (1) pression (1) surveillance (1) modèle (1) invertébré (1) analyse (1)