Experimental Infection of Bovine Mammary Gland with Prototheca zopfii Genotype 1

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  • ITO Takaaki
    Okazaki Branch of Veterinary Hospital Aichi P.F.A.M.A.A
  • KANO Rui
    Department of Pathobiology, Nihon University School of Veterinary Medicine
  • SOBUKAWA Hideto
    Department of Pathobiology, Nihon University School of Veterinary Medicine
  • OGAWA Jin
    Meat Inspection Center, Toyohashi City
  • HONDA Yayoi
    Meat Inspection Center, Toyohashi City
  • HOSOI Yoshihiro
    Meat Inspection Center, Toyohashi City
  • SHIBUYA Hisashi
    Laboratory of Veterinary Pathology, Nihon University School of Veterinary Medicine
  • SATO Tsuneo
    Laboratory of Veterinary Pathology, Nihon University School of Veterinary Medicine
  • HASEGAWA Atsuhiko
    Teikyo University Institute of Medical Mycology
  • KAMATA Hiroshi
    Department of Pathobiology, Nihon University School of Veterinary Medicine

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  • Clinical pathology: Experimental infection of bovine mammary gland with Prototheca zopfii genotype 1

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Abstract

Prototheca zopfii is divided into three genotypes, one of which, P. zopfii genotype 2, appears to be the main causative agent of bovine protothecal mastitis. However, the difference in pathogenicity between genotypes 1 and 2 has not been well investigated. In the present study, we experimentally infected normal bovine mammary gland with P. zopfii genotype 1 to investigate its pathogenicity. The mammary gland infected with P. zopfii genotype 1 showed no clinical signs. However, the histopathologic features of the infected mammary gland consisted of interstitial infiltrates of macrophages, plasma cells, lymphocytes, and fibroblasts with neutrophils in acinar lumens. Algae were present in macrophages and free in the alveolar lumens and the interstitium. Histopathology of the resultant tissue samples revealed that genotype 1 also induced a granulomatous lesion in the cow teat, similar to the mastitis lesion due to genotype 2.<br>

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