An apparent halt to the decline of Simulium woodi in the Usambara foci of onchocerciasis in Tanzania

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The authors thank Drs B. Maegga and J. Raybould for important discussions and suggestions, and for helping us to understand the historical context of our work. They are also most grateful to Dr R. Majid (coordinator of the Tanga CDTI project) and her district onchocerciasis team for guidance and provision of information about the control activities in the area. For their help with the fieldwork, A. Mwaikonyole (laboratory technician) and S. Msamila (a driver from NIMR Tukuyu) are gratefully acknowledged. The research was supported financially by the Tanzanian National Institute for Medical Research, and The Natural History Museum in London.