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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 ?
Those complications include retinopathy, a blinding disease in which tiny blood vessels in the retina begin to leak; nephropathy, in which blood vessels in the kidney are damaged; and neuropathy, in which nerves in the feet, legs, and fingertips are damaged.
Other researchers, including some at USC, are taking a somewhat different approach to treating glaucoma, a potentially blinding disease caused by a buildup of pressure inside the eye.
Blaauw and Dennis Sylvester's new system, which is targeted toward medical applications, is a pressure monitor designed to be implanted in the eye to conveniently and continuously track the progress of glaucoma, a potentially blinding disease.
In one experiment, S-antigen caused an inflammation of the pineal gland similar to the sometimes blinding disease of the retina known as uveitis.
The results demonstrated by the German team are genuinely impressive, and they represent an important step towards artificial vision that could greatly enhance the quality of life for people with an incurable, blinding disease.
Washington, Oct 21 (ANI): Scientists from NewYork-Presbyterian Hospital/Columbia have successfully restored partial vision in a 50-year-old woman, diagnosed with blinding disease at the age of 13, with the help of an electronic eye implant.