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Infection with the filaria Onchocerca volvulus ; results in skin tumors, papular dermatitis, and ocular complications.



a chronic parasitic disease that is caused by nematodes of the genus Onchocerca. Onchocerciasis occurs universally and mainly affects ungulates; the greatest economic damage arises when cattle and horses are affected. The intermediate hosts of Onchocerca are simuliids and ceratopogonids, which are bloodsucking insects. The infestation is most prevalent in pastures during the swarming time of the intermediate hosts. The mature parasites concentrate in the tendons, ligaments, and connective tissue, causing inflammatory foci that are often aggravated by pyogenic microflora.

Onchocerciasis usually occurs without observable symptoms. Diagnosis in the living animal is based on the presence of Onchocerca larvae in skin biopsies and on the results of allergic skin tests. No specific treatment is available. Onchocerciasis is prevented by protecting animals from the bites of simuliids and ceratopogonids and by exterminating these insects during hatching time, from May to August.


Skriabin, K. I., and A. M. Petrov. Osnovy veterinarnoi nematodologii. Moscow, 1964.
References in periodicals archive ?
Onchocerciasis, or river blindness, is an infectious disease endemic in 31 sub-Saharan African countries, which is estimated to have infected 26 million people.
1) With a much broader distribution range, Onchocerca volvulus is transmitted by Simulium species black flies and causes onchocerciasis with chronic skin and eye infections in about 37 million people in endemic areas of Mexico, Central and South America, West and Central Africa, and the Arabian Peninsula (Yemen).
Improved knowledge of the distribution of this species is important for understanding the potential for onchocerciasis dispersion and to serve as a basis for other studies, such as phylogeographic and ecological analyses.
Resh, who is not involved in the CellScope project, has worked in West Africa for 15 years on the control of onchocerciasis.
Beginning of the end of Onchocerciasis in the Americas
We have something like rashes on the body, onchocerciasis, malaria, and eye problem, which are too much in our community.
Onchocerciasis (river blindness) is caused by the parasitic worm Onchocerca volvulus, transmitted to humans by the bite of infected black flies of the genus Simulium, and is characterized by chronic skin disease, severe itching, and eye lesions that can progress to complete blindness.
McKee, raised in Congo as the daughter and granddaughter of Presbyterian missionaries, will share some of her experiences of growing up in the Congolese mission field and will present some of her continuing advocacy work there, particularly through the United Front Against Riverblindness, a non-profit organization that works to control and eliminate onchocerciasis, or riverblindness, a public health issue affecting 7 million people in Congo; and Femme Berceau de l'Abondance, or Woman, Cradle of Abundance, an ecumenical organization that supports women, orphans, and people living with HIV/AIDS in Congo.
Human onchocerciasis (river blindness) is a disease caused by a filarial nematode Onchocerca volvulus (1).
13) In Nigeria, the most endemic NTDs are lymphatic filariasis, schistosomiasis, onchocerciasis, trachoma and leprosy.
It was based on estimates of total blindness in Africa that were probably not representative because they were extrapolated from areas that had particularly high levels of blindness, sometimes from focal diseases such as trachoma and onchocerciasis.