Abstract
The purpose of the present study was to identify Moraxella ( M.)—like organisms recovered from calves suffering from respiratory disease down to species level by means of tDNA-intergenic spacer length polymorphism analysis (tDNA-PCR), and to perform antimicrobial susceptibility testing of these isolates using an agar dilution technique. A total of 16 isolates originating from 12 unrelated occasions were identified as Moraxella ovis, and tDNA fingerprinting showed clear delineation from other Moraxella species. The minimal inhibitory concentrations (in μg/mL) for 90% of the investigated isolates were ≤0.03 for ampicillin; 0.25 for ceftiofur; 0.5 for oxytetracycline; 8 for gentamicin; 64 for spectinomycin; 0.5/9.5 for the combination trimethoprim-sulfonamides; 4 for erythromycin; 8 for tilmicosin; 1 for florfenicol and 0.125 for enrofloxacin.
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