Antimicrobial Susceptibility of Respiratory Bacterial Pathogen Isolated from Cattle for the Past 16 Years in Tochigi Prefecture

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  • 栃木県で過去16年間に分離された牛呼吸器病原因菌の薬剤感受性調査
  • トチギケン デ カコ 16ネンカン ニ ブンリ サレタ ウシ コキュウキビョウ ゲンインキン ノ ヤクザイ カンジュセイ チョウサ

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Abstract

The authors examined the antimicrobial susceptibilities of 28 Mannheimia haemolytica (M. h) and 67 Pasteurella multocida (P. m) isolated from cattle with respiratory disease in Tochigi Prefecture between 1992 and 2007. Resistance to nalidixic acid (M. h : 25.0%, P. m : 9.0%) and dihydrostreptomycin (M. h : 21.4%, P. m :9.0%) was identified in both bacteria. Antimicrobial resistance has been increasing in isolates of both bacteria from beef cattle since 2005. In Tochigi prefecture, fluoroquinolone drugs and penicillin antibiotics were frequently used for respiratory disease in cattle. The high frequency with which quinolone drugs are used may be associated with the increase in the rate of resistance to nalidixic acid resistance in both bacteria.

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