Pathological Findings on Four Abnormally Born Calves with Infection of <I>Neospora</I>-Like Protozoa

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  • ネオスポラ様原虫の感染を伴った異常産子牛の病理像
  • ネオスポラ様原虫感染を伴った異常子牛の病理像
  • ネオスポラヨウ ゲンチュウ カンセン オ トモナッタ イジョウ コウシ ノ ビ
  • Pathological Findings on Four Abnormally Born Calves with Infection of Neospora-Like Protozoa

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Abstract

Four abnormally born calves with weakness and irregular bend of the vertebral column, cerebellar hypoplasia, or arthrogryposis of the four legs showed Toxoplasma-like tissue cysts and tachyzoites in the brain, skeletal muscle, or myocardium. Tissue cysts were round to ellipsoidal in shape with a thick cyct wall and contained numerous bradyzoites which were crescent in shape with a marginated nucleus. Formaldehyde-fixed tissue cycts and tachyzoites were subjected to immunohistochemical examinations (ABPC test; Lindsay and Dubey, 1989) using rabbit anti-Toxoplasma gondii, anti-Hammondia hammondi, anti-Neospora caninum, and anti-Sarcosystis crusi sera as primary antibody. Positive reaction was obtained only with anti-N. caninum serum. The present results suggest the occurrence of N. caninum in Japan and its causative role in the development of abnormal delivery in calves.

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