TABLE 2.
Distribution of MICs of various antimicrobial agents for 81 S. aureus isolates obtained from poultry in 2006 (recent isolates)
| Antimicrobial agent | WTb ≤ | Number of isolates with a MIC (μg/ml) of:a
|
%Rd | |||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| ≤0.03 | 0.06 | 0.12 | 0.25 | 0.5 | 1 | 2 | 4 | 8 | 16 | 32 | 64 | 128 | >128 | 256 | 512 | 1,024 | >1,024 | |||
| Enrofloxacinc | 2 | 29 | 26 | 11 | 12 | 2 | 1 | — | — | — | — | 3.7 | ||||||||
| Erythromycin | 1 | 16 | 34 | 1 | 1 | 1 | 1 | 27 | — | — | — | — | 37 | |||||||
| Gentamicin | 2 | 2 | 65 | 2 | 2 | 1 | 1 | 6 | 1 | 1 | — | — | — | — | 14.8 | |||||
| Lincomycin | 2 | 4 | 38 | 5 | 1 | 5 | 1 | 27 | — | — | — | — | 42.0 | |||||||
| Neomycin | 1 | 8 | 50 | 9 | 8 | 3 | 1 | 2 | — | — | — | — | 17.3 | |||||||
| Oxacillin | 2 | 6 | 29 | 25 | 11 | 2 | 8 | — | — | — | — | 12.4 | ||||||||
| Penicillin | 0.12 | 5 | 39 | 1 | 4 | 5 | 8 | 8 | 2 | 1 | 8 | — | — | — | — | 44.4 | ||||
| Spectinomycin | 128 | 1 | 15 | 57 | 8 | — | — | — | — | 9.9 | ||||||||||
| Sulfamethoxazole | 128 | 2 | 10 | 10 | 8 | 7 | 36 | 3 | — | 1 | 2 | 2 | 6.2 | |||||||
| Tetracycline | 1 | 2 | 1 | 30 | 2 | 1 | 2 | 1 | 2 | 32 | 3 | 5 | — | — | — | — | 56.8 | |||
| Trimethoprim | 4 | 4 | 23 | 35 | 2 | 2 | 1 | 14 | — | — | — | — | 18.5 | |||||||
| Tylosinc | 64 | 8 | 13 | 12 | 12 | 3 | 1 | 5 | 1 | 26 | — | — | — | — | 32.1 | |||||
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.