Onchocerciasis

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onchocerciasis

[‚äŋ·kō·sər′kī·ə·səs]
(medicine)
Infection with the filaria Onchocerca volvulus ; results in skin tumors, papular dermatitis, and ocular complications.

Onchocerciasis

 

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.

REFERENCE

Skriabin, K. I., and A. M. Petrov. Osnovy veterinarnoi nematodologii. Moscow, 1964.
References in periodicals archive ?
Lee, MD, eye surgeon with The Vision Center at Children's Hospital Los Angeles and a member of the physician team collaborating with the Armenian Eye Care Project (AECP), returned to Yerevan, Armenia, and neighboring rural areas last week, to educate even more doctors about complex blinding diseases in premature infants.
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Now, University of Iowa researchers have created the most detailed map to date of a region of the human eye long associated with blinding diseases, such as age-related macular degeneration.
Puliafito, and it is now routinely used to make clinical decisions about treating patients with blinding diseases such as macular degeneration, diabetic retino- pathy and glaucoma.
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Paton often met local doctors with a desire to cure blinding diseases, but they were unable to come to the United States for education.
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