ニホンウナギのビブリオ病の病理組織学的研究-1-自然感染

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1. 徳島県下の養殖場で発生したニホンウナギのビブリオ病を病理組織学的に観察した。2. 本病の主要病巣は, 皮膚から体側筋組織を巻き込んだ感染病巣であった。その病変は漿液性-出血性-組織壊死性炎で特徴づけられた。3. 全身感染症の症例では, 脾臓, 肝臓, 腎臓, 腸管などに転移病巣が頻発していた。これら転移病巣における変化は, 血行障害を伴う組織壊死であった。New vibriosis of the Japanese eel broke out in Tokushima prefecture in 1975. MUROGA et al. (1976) reported that the causative bacterium had charactaristics resembling those of V. angillicida (BRUUN. 1932). The present authors histopathologically observed this vibriosis. A small red patch in early stages or a swollen lesion exhibiting hemorrhage and cutaneous necrosis in advanced cases was observed in the trunk or tail of the diseased fish. Internal gross symptoms of the advanced cases were congested liver, swollen spleen with dark-red coloration, reddish intestine with epithiliat desquamation, softened kidney and vascular dilatation of the viscera. Histopathological observation defined that a main lesion was an infected lesion involved skin and lateral museulature. In the early lesion the bacterium penetrated the dermis, subcutaneous adipose tissue and red musculature and in the advanced cases they spread moreover myoseptum and lateral musculature. The lesion showed necrosis of the affected tissue, extensive vascular dilatation, serous exudation and hemorrhages. Epithelial slough from the edematous, hemorrhagic dermis was also accompanied in the affected skin. In particular in the advanced cases necrosis, circulatory derangements and bacterial multipoication became more intensive and extensive. The advancedcases underwent systemic infection. Metastatic lesions showing necrosis and circulatory derangements were obseryed in the spleen, liver, kidney, heart, gills and intestine which was particularly followed by desquamative catarrh.
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ニホンウナギのビブリオ病の病理組織学的研究-1-自然感染

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