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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 ?
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.
But in patients with a genetic, blinding disease called retinitis pigmentosa (RP), these light-processing cells gradually degenerate, leading to severe vision loss or total blindness.
Angiogenesis is implicated in blinding diseases such as macular degeneration, which affects an estimated 15 million people in the United States and is the leading cause of severe vision loss and blindness for those over the age of 50 in the developed world.
I believe that with its unique drug-delivery technology, Retisert will offer an efficacious treatment for this chronic, severe blinding disease," said Glenn J.
IRDs are a group of rare blinding diseases that are caused by mutations in one of more than 250 genes, leading to visual impairment.
Optometrist and member of the SIGN committee, Hal Rollason, said: "This has been an ongoing aim in Scotland for the last 10 years, due to capacity issues within the hospital eye service and the new treatments now available for blinding diseases that must be delivered very quickly after onset.
Researchers from University of Iowa developed a most detailed map to date of the abundance of thousands of proteins in the choroid, a region of the human eye long associated with blinding diseases.
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.
Zilliox will oversee the planning and execution of clinical trials through the foundation's National Eye and Evaluation Research (NEER) Network, as well as partner with institutions and companies around the world to advance promising treatments to patients affected with blinding diseases.
Paton often met local doctors with a desire to cure blinding diseases, but they were unable to come to the United States for education.
He said: "One of the greatest problems facing ophthalmologists trying to treat potentially blinding diseases is the difficulty of achieving safe and effective drug delivery to the various structures within the eye without producing serious side effects and complications.