Molecular Diagnosis of Infective Endocarditis Caused by <i>Streptococcus canis</i> in a Dog

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  • TAGAWA Michihito
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine Department of Veterinary Clinical Science, Hokkaido University
  • OHASHI Eiji
    Akashiya Animal Clinic
  • MOTOMURA Kinuyo
    Department of Basic Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • CHIBA Shiori
    Department of Basic Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • HORIUCHI Noriyuki
    Department of Basic Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • MIYOSHI Masahumi
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • INOKUMA Hisashi
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine
  • MATSUMOTO Kotaro
    Department of Clinical Veterinary Science, Obihiro University of Agriculture and Veterinary Medicine

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Other Title
  • 分子生物学的手法を用い<i>Streptococcus canis</i>による感染性心内膜炎と診断した犬の1症例
  • 小動物臨床関連部門 分子生物学的手法を用いStreptococcus canisによる感染性心内膜炎と診断した犬の1症例
  • ショウドウブツ リンショウ カンレン ブモン ブンシ セイブツガクテキ シュホウ オ モチイ Streptococcus canis ニ ヨル カンセンセイシン ナイマクエン ト シンダン シタ イヌ ノ 1 ショウレイ

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Abstract

A 10-year-old male mixed breed dog was brought to the Veterinary Medical Center at Obihiro University because of continuing fever and depression for three weeks. A heart murmur and echocardiographic findings that revealed vegetation in the mitral valves were observed in the dog. Although antibiotics and other drugs were administered, the clinical symptoms of heart failure worsened on Day 7, and the dog died of pulmonary edema on Day 10. At the necropsy, a gross examination revealed mild cardiac dilatation and multifocal vegetations in the mitral valves. Staphylococcus haemolyticus had been detected by blood culture, while DNA fragments with 100 % similarity to Streptococcus canis were detected by PCR and sequence analysis using the vegetation. It was thought that the result of the blood culture was more likely to be contamination, and molecular techniques revealed that the infective endocarditis in the case was caused by Streptococcus canis. It was necessary to consider that the bacterium which causes infective endocarditis might be different from that cultured from blood.

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