The eradication of Simulium neavei from Kenya

S. neavei, the vector of onchocerciasis, has been virtually eradicated from Kenya by larviciding measures in which DDT was used. Only a very small area remains infested and this is in the course of being treated by the Uganda medical authorities as it is part of a much larger focus occurring in that country. An account is given of the various surveys which have been carried out during the last ten years in Nyanza Province, involving 15 000 square miles (about 40 000 km(2)), and survey techniques are described. An account is given of the eradication measures carried out in North and South Nyanza, and techniques in connexion with dosing and checking operations are described. Costs for both surveys and eradication schemes are given, and minimum requirements for transport are indicated.