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Veterinary Pathology, Vol 19, Issue 1 16-22, Copyright © 1982 by American College of Veterinary Pathologists

ARTICLES

Equine onchocerciasis: lesions in the nuchal ligament of midwestern U.S. horses

G. M. Schmidt, J. D. Krehbiel, S. C. Coley and R. W. Leid

Nuchal ligaments from midwestern U.S. horses infected with adult Onchocerca sp. were studied. The prevalence of Onchocerca sp. infection in horses increased with age. Ten percent of horses less than one year old were infected, 28% of horses one to five years old, 48% of horses six to 15 years old, and 90% of horses over 16 years old. Lesions in Onchocerca sp.-infected nuchal ligaments varied with age of the horse. Horses less than five years old had few or no lesions, whereas most horses six to 15 years old had focal mineralization and granuloma formation around adult worms. In infected nuchal ligaments of horses over 16 years old, mineralization was much greater and fewer normal parasites were found. Our data suggest that infection by viable parasites is terminated naturally.




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Copyright © 1982 by the American College of Veterinary Pathologists.