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Related to Onchocerca volvulus: Wuchereria bancrofti, Mansonella ozzardi


Infection with the filaria Onchocerca volvulus ; results in skin tumors, papular dermatitis, and ocular complications.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



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.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Of the 1536 subjects skin-snipped, 334 (21.7%) were positive for Onchocerca volvulus microfilariae.
Other helminth infections were diagnosed by microscopic examination of multiple stool samples; agar stool culture (for hookwonn and Strongyloides stercoralis); skin-snip (for Onchocerca volvulus); and serologic analysis (in-house immunofluorescence test for S.
River Blindness, scientifically called onchocerciasis, is a skin and eye disease transmitted by Onchocerca volvulus, a parasite that can cause permanent blindness.
Onchocerciasis, a leading cause of blindness, is due to human infection with Onchocerca volvulus, a parasitic worm that forms nodules under the skin.
Wolbachia is also common in filarial nematodes where its removal from the female filariae by antibiotic treatments caused permanent sterilization (7) or resulting in embryo degeneration in the filarial worms Brugia pahangi and Dirofilaria immitis (8) and in worm sterility in Onchocerca volvulus (9).
Overall, current infection with Onchocerca volvulus diagnosed by skin snip was more prevalent among the 38 case-patients (76.3%) than the controls (47.4%) (matched odds ratio [mOR] = 3.2).
River blindness is caused by thread-like filarial nematode worms, Onchocerca volvulus, which are transmitted among humans through the bite of a black fly.
Ivermectin kills the larvae but not the adult worms of Onchocerca volvulus, the parasite that causes river blindness, so annual or biannual treatments are recommended to prevent resurgence.
The tiny worm that causes river blindness, Onchocerca volvulus, is a classic parasite.
Given how similar our findings are to those obtained when Onchocerca volvulus parasite mitogenomes from Latin America and Africa have been compared, they suggest that M.