TABLE 2.

Distribution of MICs of various antimicrobial agents for 81 S. aureus isolates obtained from poultry in 2006 (recent isolates)

Antimicrobial agentWTbNumber of isolates with a MIC (μg/ml) of:a%Rd
≤0.030.060.120.250.51248163264128>1282565121,024>1,024
Enrofloxacinc229261112213.7
Erythromycin1163411112737
Gentamicin2265221161114.8
Lincomycin243851512742.0
Neomycin18509831217.3
Oxacillin262925112812.4
Penicillin0.125391458821844.4
Spectinomycin1281155789.9
Sulfamethoxazole12821010873631226.2
Tetracycline1213021212323556.8
Trimethoprim4423352211418.5
Tylosinc64813121231512632.1
  • a The results in boldface type exceeded the breakpoint criteria for resistance. —, not applicable.

  • b MIC distribution for the wild-type (WT) organism according to EUCAST and categorized as WT ≤ the indicated number (μg/ml).

  • c Bimodal distribution of MICs (not available in EUCAST). The isolates with MICs in the higher ranges were considered to have acquired resistance.

  • d %R, percentage of isolates resistant to the respective antimicrobial agent.