University of Khartoum

Studies on Equine Onchocherciasis by Onchocerca Raillieti (Bain, Muller, Khamis, Guilhon And Schilhorn Von Veen, 1976) In the Sudan

Studies on Equine Onchocherciasis by Onchocerca Raillieti (Bain, Muller, Khamis, Guilhon And Schilhorn Von Veen, 1976) In the Sudan

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Title: Studies on Equine Onchocherciasis by Onchocerca Raillieti (Bain, Muller, Khamis, Guilhon And Schilhorn Von Veen, 1976) In the Sudan
Author: Saad El Din El Sammani, El Sammani
Abstract: Some aspects of onchocerciasis in Sudanese donkeys were studied and the causative agent was identified. Onchocerca volvulus microfilariae, being the causative agent of human eye lesions and blindness in many parts of the world, stimulated interest in studying other Onchocerca species occurring in animals and hence the present study was conducted to investigate incidence and prevalence of onchocerciasis in donkeys in the Sudan together with some taxonomic studies on the parasite. Taxonomic studies confirmed that the causative agent of donkey onchocerciasis is O. raillieti. The parasite is very similar to other five Onchocerca species viz. O. bohmi, O. veticalata, O. cervicalis, O. O. flexuosa and O. armillata. The predilection site of the adult is the Ligamentum nuchae. The worm was not detected from any of the sites reported in the literature and seems to replace O. cervicalis in domestic equines in the Sudan. Male worms are superficially located along the lamellar funicular parts of the ligament, while the females are found deeply buried in the fibrous tissues and in most cases are encapsulated and calcified. The microfilariae of O. raillieti are skin dwellers and therefore diagnosis is facilitated by releasing microfilariae from skin snips taken from predilection sites of microfilariae in a suitable medium. The main site of concentration of the microfilariae is the region of the Linea alba. High microfilarial concentrations were also encountered along the region of the withers in heavy infections. However, microfilariae can be detected from all parts of the hide. The microfilariae were best released in Tyrodes solution containing serum, in which case they can be kept alive and vigorously moving for more than 24 hours. A survey for the incidence and prevalence of donkey onchocerciasis was undertaken in selected areas of the Sudan viz. El Shiwarif, El Gedarif, Tenddalty and Omdurman. The condition was found to be a high prevalence throughout the country, especially in El Gedarif area where an incidence of 90% was recorded. The life cycle of O. raillieti is yet to be elucidated and the vector of this worm could well be a Culicoides species.
URI: http://khartoumspace.uofk.edu/handle/123456789/14392
Date: 2015-06-23


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