Table 2. Determination and interpretation of the MIC values of the antibiotics tested for Escherichia coli (n = 211).
| Antibiotic | MIC range | MIC50 (µg/ml) | Interpretation* | MIC90 (µg/ml) | Interpretation* |
| Amp/sulb | 0.5/0.25–>256/128 | 16/8 | I | >256/128 | R |
| Pip/taz | ≤0.06/4–>128/4 | 8/4 | S | >128/4 | R |
| Cefminox | ≤0.06–>128 | 1 | No criteria | 128 | No criteria |
| Cefmetazole | 0.12–>128 | 1 | S | >128 | R |
| Ceftazidime | ≤0.03–>64 | 16 | R | >64 | R |
| Ceftriaxone | ≤0.06–>128 | >128 | R | >128 | R |
| Aztreonam | ≤0.06–>128 | 32 | R | >128 | R |
| Fosfomycin | ≤0.25–>256 | 0.5 | S | 4 | S |
| Imipenem | ≤0.03–>64 | 0.12 | S | 64 | R |
| Meropenem | ≤0.06–>128 | ≤0.06 | S | 64 | R |
| Doripenem | ≤0.03–>64 | ≤0.03 | S | 64 | R |
| Biapenem | ≤0.06–>128 | ≤0.06 | No criteria | 16 | No criteria |
| Amikacin | ≤0.06–>128 | 2 | S | >128 | R |
| Arbekacin | ≤0.06–>128 | 2 | No criteria | >128 | No criteria |
| Gentamicin | ≤0.06–>128 | 16 | R | >128 | R |
| Colistin | 0.06–>32 | 0.25 | No criteria | 0.5 | No criteria |
*The interpretation of the MIC50 and MIC90 of all antibiotics tested for all pathogens was performed using the Clinical and Laboratory Standards Institute (CLSI) 2012 guidelines.
Abbreviations: S: susceptible, R: resistant, I: intermediate, amp/sulb: ampicillin/sulbactam, pip/taz: piperacillin/tazobactam, MIC: minimum inhibition concentration.