Table 2.
Antimicrobial susceptibility of 30 clinically isolated MDR-PA strains against currently used antibiotics
| Antibiotics | MIC range | MIC50 | MIC90 | % susceptibility | ||
|---|---|---|---|---|---|---|
| (μg/ml) | (μg/ml) | (μg/ml) | S | I | R | |
| Colistin | 2–8 | 4 | 8 | 23.3 | 63.4 | 13.3 |
| Meropenem | 1–1024 | 16 | 64 | 3.3 | 6.7 | 90 |
| Imipenem | 2–512 | 16 | 32 | ND | 16.7 | 83.3 |
| Doripenem | 0.5–256 | 4–8 | 16 | 3.3 | 43.3 | 53.4 |
| Ciprofloxacin | 0.5–128 | 64 | 128 | 10 | ND | 90 |
| Piperacilin | 2–1024 | 256 | 1024 | 36.7 | ND | 63.3 |
| Ceftazidime | 2– > 2048 | >2048 | >2048 | 6.7 | 3.3 | 90 |
MIC range MIC values from lowest to highest, MIC50 MIC is position of percentile 50, MIC90 MIC is position of percentile 90, S sensitive, COL (≤2 μg/ml), MEM (≤2 μg/ml), IMI (≤2 μg/ml), DOR (≤2 μg/ml), CIP (≤1 μg/ml), PIP (≤16 μg/ml), and CAZ (≤8 μg/ml), I intermediate, COL (4 μg/ml), MEM (4 μg/ml), IMI (4 μg/ml), DOR (4 μg/ml), CIP (2 μg/ml), PIP