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O. volvulus is transmitted by sandflies, and their role in the transmission of onchocerciasis was discovered by the Scottish parasitologist Breadablane Blacklock in Sierra Leone in the mid-1920s (19). There are accounts of the history of onchocerciasis by Grove (105) and Muller (192).
Onchocerciasis ICD-9 125.3. This article focuses on the ophthalmic consequences of this systemic disease. Onchocerciasis (âAfrican River Blindnessâ) is a filarial infection caused by the nematode Onchocerca volvulusâone of the nine worldwide filarial nematodes in which humans are the definitive host.