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Mortierella wolfii keratomycosis in a horse

Authors

  • Shinya Wada,

    1. Racehorse Hospital, Ritto Training Center, The Japan Racing Association (JRA), 1028, Misono, Ritto, Shiga 520-3085, Japan
    2. Clinical Science and Pathobiology Division, Equine Research Institute (ERI), JRA, 321-4, Tokami-cho, Utsunomiya, Tochigi 320-0856, Japan
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    • Both authors contributed equally to this report.

  • Hirotaka Ode,

    1. Racehorse Hospital, Ritto Training Center, The Japan Racing Association (JRA), 1028, Misono, Ritto, Shiga 520-3085, Japan
    2. Racehorse Hospital, Miho Training Center, JRA, 2500-2, Mikoma, Miho, Inashiki, Ibaraki 300-0493, Japan
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    • Both authors contributed equally to this report.

  • Seiji Hobo,

    1. Racehorse Hospital, Ritto Training Center, The Japan Racing Association (JRA), 1028, Misono, Ritto, Shiga 520-3085, Japan
    2. Microbiology Division, Tochigi Branch, Epizootic Research Center, ERI, JRA, 1400-4, Shiba, Shimotsuke, Tochigi 329-0412, Japan
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  • Hidekazu Niwa,

    1. Microbiology Division, Tochigi Branch, Epizootic Research Center, ERI, JRA, 1400-4, Shiba, Shimotsuke, Tochigi 329-0412, Japan
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  • Yoshinari Katayama,

    1. Microbiology Division, Tochigi Branch, Epizootic Research Center, ERI, JRA, 1400-4, Shiba, Shimotsuke, Tochigi 329-0412, Japan
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  • Kosuke Takatori

    1. National Institute of Health Sciences, 1-18-1, Kami-yoga, Setagaya, Tokyo 158-8501, Japan
    2. Center for Fungal Consultation Japan, 13-1, Yukigayaotsuka-cho, Ota, Tokyo 145-0067, Japan
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Address communications to:
S. Wada
Tel.: +81-28-647-0728
Fax: +81-28-647-0686
e-mail: shinya_wada@jra.go.jp

Abstract

Purpose  To describe a case of superficial keratomycosis caused by Mortierella wolfii (M. wolfii) in a horse.

Methods  A thoroughbred filly was presented with painful right eye of 2 days’ duration. A superficial corneal ulcer was observed ventrally together with multifocal punctuate opacities axially. Samples were collected by swabbing and scraping the ulcerated lesion and submitted for microbiologic and cytologic examination.

Results  Microscopic evaluation of debrided corneal tissue revealed the presence of nonseptate fungal hyphae, and culture of a corneal swab yielded fungal growth. Medical treatment with topical antifungal, antibiotic and autogenous serum and systemic anti-inflammatory resolved the problem within 2 weeks.

Conclusions  Cytologic evaluation of a corneal scraping was useful to make a clinical diagnosis of keratomycosis. Based on the mycological characteristics, the fungus isolated from the corneal lesion was identified as M. wolfii. To the authors’ knowledge, this is the first case report of equine keratomycosis associated with this fungus, although the organism is known to infect various organs of cattle.

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