Pinworm - Donkey
Pinworm - Oxyuris equi
Introduction
Oxyuris. equi, the equine pinworm, is a well known equine parasite with a worldwide distribution. They are commonly called pinworm because of the sharp, tapering tails of the females measuring up to 15 cm long. Adults primarily live in the right dorsal colon but may inhabit the proximal sections of the large intestine if worm burden is high. The characteristic feature of this parasite is that gravid female worms migrate to the anus to deposit their eggs in sticky clumps seen grossly as a yellowish white or light orange gelatinous streak on the skin of the perianal region. Although some mucosal damage caused by the feeding habit of L4 were reported, a more important effect of this parasite is the perianal irritation and anal pruritis caused by the adult females during the egg laying process. Although a well know equine parasite, O equi received little attention because it was relatively non-pathogenic and could be controlled satisfactorily by routine anthelmintic therapy. However, in recent years, it appeared to exhibit a dramatic change in its biology and anthelmintic susceptibility. This once rare parasite seems to be on the increase in donkeys in the UK.
Diagnosis
This is often based on clinical signs and the recovery of eggs from the perianal skin. Sometimes adult worms can be seen passed in the faeces.
Clinical signs
Tail-rubbing accompanied by broken hair shafts, or excoriated skin on the rump or base of the tail is a frequent diagnostic feature. Donkeys do not, however, appear to demonstrate this behaviour as frequently as horses. The intense itching often leads to restlessness and impaired feeding, causing some loss of condition.
Laboratory tests
Unlike other nematode parasites of donkeys and horses, pinworm eggs are rarely observed in faecal samples due to the unique egg-laying behaviour of the females. However, O. equi eggs can be collected by pressing clear sticky tape onto the perianal skin and applying the tape to a glass slide for direct microscopic observation.
Treatment
- Routine anthelmintic treatment and symptomatic care - see treatment of strongyles
Control
- Routine anthelmintic programme
- Responds well to most of the common anthelmintic compounds
- Periodic steam-cleaning of stables
Literature Search
Use these links to find recent scientific publications via CAB Abstracts (log in required unless accessing from a subscribing organisation).
Pinworm in donkeys publications
References
- Trawford, A. and Getachew, M. (2008) Parasites In Svendsen, E.D., Duncan, J. and Hadrill, D. (2008) The Professional Handbook of the Donkey, 4th edition, Whittet Books, Chapter 6
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