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Table 1 Susceptibility breakpoint zone diameters (mm) used in the study.

From: Antimicrobial resistance in Staphylococcus spp., Escherichia coli and Enterococcus spp. in dogs given antibiotics for chronic dermatological disorders, compared with non-treated control dogs

  Staphylococci E.coli Enterococci Respective MIC -value for susceptible srains *
Betalactams     
Penicillin G 10 IU ≥29    ≤0.12 μg/ml
Ampicillin 10 μg   ≥17 ≥17 ≤8 μg/ml
Amoxillin-clavulanate (2:1) 30 μg ≥17    -
Cephalotin 30 μg ≥18    ≤8 μg/ml
Cefotaxime 30 μg   ≥18   -
Oxacillin 1 μg ≥13    ≤2 μg/ml
Macrolides and lincosamides     
Erythromycin 15 μg ≥16    -
Clindamycin 2 μg ≥21    ≤0.5 μg/ml
Aminoglycosides     
Streptomycin 10 μg   ≥15   -
Gentamicin 10 μg   ≥19   -
Others     
Chloramphenicol 30 μg   ≥20   -
Enrofloxacin 5 μg   ≥21   ≤0.25 μg/ml
Trimethoprim/sulfamethoxazole 1.25/23.75 mg (SXT) ≥16 ≥16   ≤2/38 μg/ml
Tetracycline 30 μg ≥21 ≥19   for E.coli: ≤4 μg/ml
Vancomycin 30 μg    ≥18 -
  1. *The respective MIC -value is, if found, from the NCCLS standards. Susceptibility breakpoints are those used by The National Veterinary and Food Research Institute at the time this study was made, and they partly differed from the NCCLS (1997) standards.