The relationship between <i>Moraxella bovoculi</i> and the severity of ocular lesions in heifers in a dairy farm with a high incidence of infectious bovine keratoconjunctivitis

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  • Chiba Y.
    Division of Clinical Veterinary Medicine, Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • Itoh M.
    Division of Clinical Veterinary Medicine, Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine
  • Tsuchiya H.
    Tsuchiya Livestock Clinic
  • Kusumoto A.
    Diagnostic Center for Animal Health and Food Safety, Obihiro University of Agriculture and Veterinary Medicine
  • Kayano M.
    Research Center for Global Agromedicine, Obihiro University of Agriculture and Veterinary Medicine
  • Takahashi E.
    Division of Clinical Veterinary Medicine, Department of Veterinary Medicine, Obihiro University of Agriculture and Veterinary Medicine

Bibliographic Information

Other Title
  • 伝染性角結膜炎が多発した乳用牛育成牧場から検出された <i>Moraxella bovoculi</i> と眼病変重症化との関連
  • 伝染性角結膜炎が多発した乳用牛育成牧場から検出されたMoraxella bovoculiと眼病変重症化との関連
  • デンセンセイカク ケツマクエン ガ タハツ シタ ニュウヨウギュウ イクセイ ボクジョウ カラ ケンシュツ サレタ Moraxella bovoculi ト ガン ビョウヘン ジュウショウカ ト ノ カンレン

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Abstract

<p>　Infectious bovine keratoconjunctivitis（IBK）, also known as pinkeye, is an infectious disease characterized by keratitis, which can progress into corneal ulceration in severe cases. IBK causes significant economic losses for farmers due to reduced weight gain and increased cost for antibiotic treatment. We examined the presence of Moraxella and Mycoplasma spp. in the conjunctiva of 36 Holstein heifers（12 heifers with corneal and conjunctival lesions, 12 heifers with conjunctival lesions, and 12 heifers with no ocular lesions）from a public farm where keratoconjunctivitis was prevalent. Moraxella bovoculi and Moraxella bovis were detected in 11 and 1 heifers with corneal and conjunctival lesions, in 4 and 5 heifers with conjunctival lesions（including one with mixed infection）,and in 1 and 4 heifers with no ocular lesions, respectively. Thus, Moraxella bovis, which is reported to be the main causative agent of IBK, was mainly detected in the heifers with no ocular lesions and those with conjunctival lesions. On the other hand, Moraxella bovoculi, which has an unclear role in the IBK pathogenicity, was mainly detected in cows with more severe keratoconjunctivitis with corneal and conjunctival lesions. Mycoplasma bovoculi was detected from 10 heifers with severe lesions, 10 heifers with mild lesions and 9 asymptomatic heifers, but no association was found between infection and severity of the eye lesions. In conclusion, understanding the role of Moraxella bovoculi infection is important in severe keratoconjunctivitis in cattle.</p>

Journal

  • Japanese Journal of Large Animal Clinics

    Japanese Journal of Large Animal Clinics 12 (1), 21-26, 2021-04-30

    Japanese Society of Large Animal Clinics / Large Animal Clinic Research Association / Kyushu-Okinawa Society for Large Animal Medicine

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