TABLE 1.

Distribution of MICs of various antimicrobial agents for 90 S. aureus isolates obtained between 1970 and 1972 (old isolates)

Antimicrobial agentWTbNumber of isolates with a MIC (μg/ml) of:a%Rd
≤0.030.060.120.250.51248163264128>1282565121,024>1,024
Enrofloxacinc272180
Erythromycin111362811416.7
Gentamicin23254222.2
Lincomycin293722531121018.9
Neomycin1186660
Oxacillin24473540
Penicillin0.12311352364.4
Spectinomycin128236611.1
Sulfamethoxazole128243230369133.3
Tetracycline126173152948.9
Trimethoprim4437490
Tylosinc64152727911113.3
  • 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.