A Pathologic Study on Ocular Disorders in Calves in Southern Kyushu, Japan.

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  • USHIGUSA Takahiro
    Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan
  • UCHIDA Kazuyuki
    Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan
  • MURAKAMI Takayuki
    Department of Anatomy, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan
  • YAMAGUCHI Ryoji
    Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan
  • TATEYAMA Susumu
    Department of Veterinary Pathology, Faculty of Agriculture, Miyazaki University, Miyazaki 889-2192, Japan

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  • 南九州地域における子牛の眼球疾患に関する病理学的検索
  • pathologic study on ocular disorders in calves in Southern Kyushu Japan

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Of 822 calves, ranging in age between one day and six months necropsied between 1996 and 1998 at Miyazaki University, histological examination showed that 25 (3.0 %) had ocular lesions. These ocular lesions consisted of suppurative inflammation (13 cases), cataract (seven cases), and retinal atrophy (five cases). Inflammatory changes were classified as suppurative keratitis (one case), keratitis and uveitis (ten cases), and uveitis and retinitis (two cases). Cataract was subclassified into three categories; cortical (three cases), nuclear (one case), and mature (three cases). These lesions were characterized by degenerative changes in the lens fibers and the appearance of eosinophilic globules known as Morganian globules. In the most severely affected case, there was capsular rupture of the lens, resulting in severe infiltration by eosinophils and histiocytes of the whole anterior chamber. Almost all the calves with retinal atrophy had been suffering from severe hydranencephaly and three had significantly raised levels of neutralization antibodies for the Akabane and/or Aino viruses. This study indicates that congenital arbovirus infections may predispose calves to ocular diseases, especially retinal atrophy.

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