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Table 1 Susceptibility pattern of 53 imipenem-non-susceptible Acinetobacter baumanni i strains to 12 antimicrobial agents
| Antimicrobial | Disk Diffusion | |||||||
|---|---|---|---|---|---|---|---|---|
| Disc content | Zone diameters* (mm) | Equivalent MICs breakpoints * (mg/l) | Results of disk diffusion n (%) | |||||
| S | R | S | R | S | I | R | ||
| Amikacin | 30 μg | ≥17 | <15 | ≤8 | >16 | 25 (47,2) | 1 (1,9) | 27 (50,9) |
| Tobramycin | 10 μg | ≥16 | <16 | ≤4 | >4 | 36 (67,9) | 0 | 17 (32,1) |
| Gentamycin | 15 μg | ≥16 | <16 | ≤4 | >4 | 1 (1,9) | 0 | 52 (98,1) |
| Ampicillin/Sulbactam‡ | 10 μg/10 μg | ≥15 | ≤11 | ≤8/4 | ≥32/16 | 42 (79.2) | 0 | 11 (20.8) |
| Ticarcillin/clavulanic acid | 75/10 μg | ≥22 | <18 | ≤16/2 | >64/2 | 1 (1,9) | 0 | 52 (98,1) |
| Piperacilin-Tazobactam | 75/10 μg | ≥19 | <14 | ≤16/4 | >64/4 | 0 | 1 (1,9) | 52 (98,1) |
| Ceftazidime | 30 μg | ≥21 | <19 | ≤4 | >8 | 3 (5,7) | 0 | 50 (94,3) |
| Ciprofloxacin | 5 μg | ≥22 | <19 | ≤1 | >2 | 1 (1,9) | 0 | 52 (98,1) |
| Sulfamethoxazole/trimethoprim | 23.75/1.25 μg | ≥16 | <13 | ≤38/2 | >76/4 | 0 | 0 | 53 (100) |
| Imipenem | 10 μg | ≥24 | <17 | ≤2 | >8 | 0 | 4 (7.5) | 49 (92.5) |
| Colistin | 50 μg | ≥15 | <15 | ≤2 | >2 | 53 (100) | 0 | 0 |
| MICs | S | R | MIC50 (mg/l) MIC 90 (mg/l) | |||||
| Imipenem | ≤2 | >8 | 32 | 32 | ||||
| Meropenem | ≤2 | >8 | ≥32 | ≥32 | ||||
