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J Vet Sci 2017; 18(4): 551-554  https://doi.org/10.4142/jvs.2017.18.4.551
Eosinophilic encephalomyelitis in horses caused by protostrongylid parasites
Eun-Jung Bak1, Young-Hwa Jean2, Gye-Hyeong Woo3,*
1College of Dentistry, Yonsei University, Seoul 03722, Korea
2Animal and Plant Quarantine Agency, Gimcheon 39660, Korea
3Laboratory of Histopathology, Department of Clinical Laboratory Science, Semyung University, Jecheon 27136, Korea
Correspondence to: Gye-Hyeong Woo
Tel: +82-43-649-1539; Fax: +82-43-649-7361; E-mail: ghwoo@naver.com
Received: October 24, 2016; Revised: January 9, 2017; Accepted: February 7, 2017; Published online: December 31, 2017.
Four thoroughbred horses showing lameness, ataxia, circling, depression, recumbency, and seizures, were examined. The horses had gross, pale- to dark-red manifestations and foci in the central nervous system (CNS). Multifocal to coalescing eosinophilic necrotizing encephalomyelitis was observed histologically in the CNS along with intact or degenerated nematodes. Nematodes had polymyarian-coelomyarian musculature, a smooth thin cuticle, and intestines lined by multinucleated cells with microvilli. These traits suggested the nematodes belonged to the family Protostrongylidae, which includes Parelaphostrongylus tenuis. It was concluded that the horses were infected by nematodes, presumably Parelaphostrongylus tenuis, resulting in eosinophilic necrotizing encephalomyelitis.
Keywords: Parelaphostrongylus tenuis, central nervous system, encephalomyelitis, horses, nematode

© 2017 The Korean Society of Veterinary Science.

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