Miscarriage of Swine Due to <i>Leptospira interrogans</i> serovar Hebdomadis

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  • <i>Leptospira interrogans </i>serovar Hebdomadisによる豚異常産事例
  • Leptospira interrogans serovar Hebdomadisによる豚異常産事例
  • Leptospira interrogans serovar Hebdomadis ニ ヨル ブタ イジョウサン ジレイ
  • Miscarriage of Swine Due to Leptospira interrogans serovar Hebdomadis

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Abstract

Five fetuses of sows in the consistent management hoggery, which will breed 572 sows in Okinawa Prefecture, Japan, were miscarried in March 2013, and pathological appraisals were carried out since the frequency of occurrence was higher than usual. Petechial hemorrhage of the entire skin, hemorrhage of subcutaneous parts of the skin and lungs and white macules on the liver of aborted fetus No. 3 were observed at necropsy. No bacteria were isolated. The leptospira flaB gene was detected in the main internal organs of the miscarried pigs. The sow had 5,120 times the antibodies and the humors of the fetuses of the sow had 80 times the antibodies for Leptospira interrogans serovar Hebdomadis. Focal necrosis of the liver, interstitial nephritis and purulent dermatitis were observed histologically in fetus No. 3. Numerous leptospira-like spirochaetes were observed around the blood vessels of the main organs, thymus, digestive organs, and skin through Warthin-Starry staining. Immunohistochemically, L. Hebdomadis antigens were detected in the same part. According to the above results, the present cases were diagnosed as miscarriage due to L. Hebdomadis infection.

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