| a survey of simulium control in africa. | it has become possible to control or even eradicate the simulium fly vectors of onchocerca volvulus, the causative organism of onchocerciasis. there are two vectors in africa-namely, s. damnosum, characteristic of the rivers of west africa, and s. neavei, which breeds on the carapaces of crabs in the streams of east africa. the use of ddt applied to the water at a concentration as low as 0.1 p.p.m. for 30 minutes eliminates the larvae of simulium. such larvicidal methods have eradicated s. neave ... | 1962 | 14015908 |