Protection (8) surveillance (7) parasite (7) insecticide (7) Protection (7) Onchocerciasis (7) Human ecology--Study and teaching (7) programme (6) onchocercose (6) Control (6) Afrique de l'Ouest (5) Afrique (5) Africa, West (5) Rivers (4) Insecticides (4) Monitoring (3) Development (3) amélioration génétique (2) science (2) fleuve (2) évaluation du risque (2) surveillance (2) faune (2) maladie (2) droits (2) Treatment (2) Breeding (2) Onchocerca volvulus (2) Risk assessment (2) Simulium damnosum (2)