Minimum inhibitory concentrations of selected antimicrobial agents for moraxella bovoculi associated with infectious bovine keratoconjunctivitis

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Abstract

Infectious bovine keratoconjunctivitis (IBK) has been associated with ocular infections by Moraxella bovis, the established etiologic agent of IBK, and more recently, Moraxella bovoculi, a recently described species of Moraxella. To assist in designing rational treatment regimens for M. bovoculi infections associated with IBK, the in vitro susceptibilities of 57 M. bovoculi field isolates cultured from eyes of cattle with IBK in California from 2002 through 2007 were determined. The minimum inhibitory concentration required to inhibit the growth of 90% of organisms (MIC 90) of the following 18 antibiotics tested in the present study were: danofloxacin and enrofloxacin: ≤0.12 μg/ml; ampicillin and ceftiofur: ≤0.25 μg/ ml; penicillin: 0.25 μg/ml; gentamicin: ≤1 μg/ml; chlortetracycline, oxytetracycline, and tiamulin: 1 μg/ml; florfenicol: 0.5 μg/ ml; trimethoprim-sulfamethoxazole: ≤2/38 μg/ml; clindamycin: 2 μg/ml; neomycin and tilmicosin: ≤4 μg/ml; tulathromycin: 4 μg/ml; spectinomycin and tylosin: 16 μg/ml; and sulfadimethoxine: >256 μg/ml. The low MIC 90 of these M. bovoculiisolates suggests that commonly used antibiotics for treatment of IBK associated with M. bovis should also be effective against M. bovoculi.

Original languageEnglish (US)
Pages (from-to)552-555
Number of pages4
JournalJournal of Veterinary Diagnostic Investigation
Volume23
Issue number3
DOIs
StatePublished - May 2011

Keywords

  • Infectious bovine keratoconjunctivitis
  • Minimum inhibitory concentration
  • Moraxella bovis
  • Moraxella bovoculi

ASJC Scopus subject areas

  • veterinary(all)

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