Onchocerciasis - Donkey
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Introduction
Onchocerca cervicalis affects the skin indirectly when either the microfilaria or the larvae are deposited in the skin capillaries. In the latter case the effects are limited and most obvious following administration of an avermectin wormer.
Clinical signs
The classical signs include ulcerating skin nodules in the withers region (fistulous withers involving the withers bursa) or the skin overlying tendons of the limbs.
Diagnosis
Onchocerca can be difficult to diagnose.
Treatment
Treatment is limited to the use of avermectins administered orally. Donkeys that receive regular avermectin wormers are usually not affected and so this history is useful to establish.
References
- Knottenbelt, D. (2008) Skin disorders In Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) The Professional Handbook of the Donkey, 4th edition, Whittet Books, Chapter 8
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