Isospora suis に起因する哺乳豚のコクシジウム症 [in Japanese] Neonatal Porcine Coccidiosis Caused by Isospora suis [in Japanese]
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2004年6月から9月にかけて岩手県内の1養豚場で生産された哺乳豚867頭中700頭が5～9日齢時から黄色水様下痢を示し, 70頭が死亡あるいは発育不良により淘汰された.病豚1頭および回復豚2頭を病理学的および病原学的に検索した.主要病変は空回腸に存在し, 病豚では線維素壊死性腸炎, 回復豚では腸絨毛の顕著な萎縮が観察され, 前者はさまざまな発育期の<I>Isospora suis</I>を伴っていた.同オーシストが病豚の直腸内容から得られたが, 繁殖雌豚からは検出されなかった.他の病原体が本症に関与したことを示唆する成績は得られなかった.以上の結果から, 本症がI. suis感染に起因していたことが示唆された.哺乳豚の保温箱および分娩房をオルソ剤およびスチームにより消毒した後に新たな発生が著しく減じたことから, 感染源は分娩房内に存在したと推察された.
During the period from June to September 2004, 700 of 867 nursing piglets experienced yellowish diarrhez with a watery consistency on a swine farm in Iwate Prefecture. Clinical signs of the disease were found among five- to nine-day-old piglets. Seventy piglets died or were eradicated for retarded growth. One affected and two convalescent piglets were examined pathologically and pathogenetically. The principal lesions were present in the jejunum and ileum. Fibrinonecrotic enteritis with <I>Isospora suis</I> in various stages of development was observed in the affected piglet, and a pronounced atrophy of the intestinal villi was found in the convales-cent piglets. Oocysts of the organism were obtained from the rectal contents of the affected piglets, but not from those of the sows. There was no evidence to suggest that other enteropathogens had been associated with the disease. These results indicate that this outbreak would have been caused by an I. suis infection. Since the occurrence was markedly diminished after the farrowing crates and concrete floor were disinfected with orthodichlorobenzene and steam, the sources of the infection may have been present under the farrowing environment.
- Journal of the Japan Veterinary Medical Association
Journal of the Japan Veterinary Medical Association 59(4), 249-253, 2006-04-20
Japan Veterinary Medical Association