ANTIMICROBIAL SUSCEPTIBILITY TESTING OF 59 STRAINS OF CAMPYLOBACTER-FETUS SUBSP FETUS

The susceptibilities of 59 Campylobacter fetus subsp.fetus isolates to eight antibiotics were studied by the agar dilution, E-test, and disk diffusion methods, None of the isolates were beta-lactamase producers . All were susceptible to ampicillin, gentamicin, imipenem, and merope nem as determined by the three methods, with MICs at which 90% of the isolates are inhibited (MIC(90)s) (determined by agar dilution) of 2, 1, less than or equal to 0.06, and 0.12 mu g/ml, respectively. Twenty- seven percent of the isolates were resistant to tetracycline, with com plete agreement between the agar dilution and disk diffusion results, The MIC(90)s determined by agar dilution were 2 mu g/ml for erythromyc in, 1 mu g/ml for ciprofloxacin, and 8 mu g/ml for cefotaxime.