Segmented Filamentous Bacteria attached to the Epithelial Cells of the Ileum in Piglets with Diarrhea

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  • YAGUCHI Yuji
    Ibaraki Prefectural Kenhoku Livestock Hygiene Service Center
  • SHIBAHARA Tomoyuki
    National Institute of Animal Health, National Agricultural and Food Research Organization
  • KUSUHARA Toru
    Ibaraki Prefectural Rokkou Livestock Hygiene Service Center
  • KOBAYASHI Masaru
    National Institute of Animal Health, National Agricultural and Food Research Organization
  • KOBAYASHI Hideki
    National Institute of Animal Health, National Agricultural and Food Research Organization

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Other Title
  • 下痢の子豚にみられた回腸粘膜上皮細胞に付着するセグメント細菌
  • ゲリ ノ コブタ ニ ミラレタ カイチョウ ネンマク ジョウヒ サイボウ ニ フチャク スル セグメント サイキン

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Three 40-day-old piglets showed diarrhea and poor growth, and were euthanized for a laboratory examination. The necropsies revealed that the mucosa of the ileum were thickened with enlarged and prominent Peyer's patches. Histologically, the number of lymphatic follicles was increased in the ileal Peyer's patches, and atrophy of the villi in the ileum was detected. Numerous filamentous bacteria were attached to the epithelium cells of the ileum. They had a beaded appearance and stained gram positive or negative. The ultrastructure of the organisms was consistent with that of segmented filamentous bacteria (SFB). None of the piglets had any lesions other than SFB-like ones. It is suggested that severe SFB infection in the epithelial cells of the ileum may accelerate diarrhea in wasting pigs.

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