Pathological and Bacteriological Analysis of Necrotic Suppurative Myocarditis and Fibrinous Pericarditis Caused by <i>Histophilus Somni</i> Infection in a Calf

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  • FURUTA Nobumichi
    Yamagata Prefecture Central Livestock Hygiene Service Center
  • UENO Yuichi
    National Institute of Animal Health, National Agricultural and Food Research Organization
  • OJIMA Toru
    Yamagata Prefecture Central Livestock Hygiene Service Center

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Other Title
  • 牛の壊死性化膿性心筋炎・線維素性心外膜炎を主徴とする<i>Histophilus somni</i>感染症の病理学的及び細菌学的解析
  • 牛の壊死性化膿性心筋炎・線維素性心外膜炎を主徴とするHistophilus somni感染症の病理学的及び細菌学的解析
  • ウシ ノ エシセイ カノウセイ シンキンエン ・ センイ スジョウシン ガイマクエン オ シュチョウ ト スル Histophilus somni カンセンショウ ノ ビョウリガクテキ オヨビ サイキンガクテキ カイセキ

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Abstract

<p>In this study, we pathologically analyzed a clinical case of Histophilosis or a Histophilus somni -associated disease that occurred in Yamagata Prefecture, Japan. An isolate from a heart lesion and two past isolates (from encephalitis and from pneumonia) were analyzed for the antigen type of the major outer membrane protein (MOMP) and cytotoxicity to EBTr cells. Pathognomonic dissection found a villous heart, and histopathological examination revealed fibrinous pericarditis. MOMP antigen typing showed that isolates from this case and pneumonia were classified as type 3c, and the isolate from encephalitis was type 1. In the experiment on the cytotoxicity of the three isolates to EBTr cells, the isolate from encephalitis was a strong cause of cellular impairment. On the other hand, cellular impairment of the other two isolates was diminished. These results suggest that the cytotoxicity of the isolate from this case is weaker than the isolate from encephalitis, and the weak cytotoxicity caused the villous heart, resulting from a chronic process.</p>

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