Table 4. Determination and interpretation of the MIC values of the antibiotics tested for Pseudomonas aeruginosa ** (n = 153).
| Antibiotic | MIC range | MIC50 (µg/ml) | Interpretation* | MIC90 (µg/ml) | Interpretation* |
| Pip/tazo | 0.5–>128 | 8/4 | S | >128/4 | R |
| Cefminox | 64–>128 | >128 | No criteria | >128 | No criteria |
| Cefmetazole | 64–>128 | >128 | No criteria | >128 | No criteria |
| Ceftazidime | 0.25–>64 | 8 | S | >64 | R |
| Ceftriaxone | 1–>128 | 64 | No criteria | >128 | No criteria |
| Aztreonam | 0.12–>128 | 4 | S | >128 | R |
| Fosfomycin | 1–>256 | 32 | No criteria | 256 | No criteria |
| Imipenem | 0.25- >64 | 8 | R | >64 | R |
| Meropenem | ≤0.06–>128 | 4 | I | >128 | R |
| Doripenem | ≤0.03–>64 | 2 | S | >64 | R |
| Biapenem | ≤0.06–>128 | 2 | No criteria | 128 | No criteria |
| Amikacin | 0.25–>128 | 4 | S | >128 | R |
| Arbekacin | 0.12–>128 | 1 | No criteria | 32 | No criteria |
| Gentamicin | ≤0.06–>128 | 2 | S | >128 | R |
| Colistin | 0.12–16 | 1 | S | 2 | S |
*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.
**Pseudomonas aeruginosa is intrinsically resistant to ampicillin/sulbactam and thus, MIC testing was not performed for this antibiotic.
Abbreviations: S: susceptible, R: resistant, I: intermediate, pip/taz: piperacillin/tazobactam, MIC: minimum inhibition concentration.