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Antibiotic susceptibilities of recent isolates of Mycopasma bovis in Belgium
  1. A. Thomas, DVM, PhD1,
  2. C. Nicolas, DVM1,
  3. I. Dizier1,
  4. J. Mainil, DVM, PhD1 and
  5. A. Linden, DVM, PhD1
  1. 1 Department of Infectious and Parasitic Diseases, Faculty of Veterinary Medicine, University of Liège, B43A, Sart Tilman, B-4000 Liège, Belgium

Abstract

The susceptibilities of 40 recent Belgian field isolates of Mycoplasma bovis to 10 antimicrobial agents were assessed. Tiamulin was the most active antimicrobial agent against M bovis, with an initial inhibitory concentration (IIC50) of 0-06 μg/ml, but it is not licensed for the treatment of cattle. All three fluoroquinolones tested (danofloxacin, enrofloxacin and marbofloxacin) were effective against strains of M bovis, and had a minimum mycoplasmacidal concentration (MMC50) less than or equal to 1 μg/mI. Gentamicin was poorly effective, having an IIC50 of 8 μg/mI. Many strains of M bovis were resistant to tylosin, spectinomycin, lincomycin, tetracycline and oxytetracycline.

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