TABLE 1.
Susceptibilities of 590 E. coli isolates to antimicrobial agents
| Antibiotic | MICa range (mg/liter) | MIC50 (mg/liter) | MIC90 (mg/liter) | Resistance rate (%) |
|---|---|---|---|---|
| Ampicillin | 0.25 to >512 | 512 | >512 | 84.9 |
| Piperacillin≤ | ≤0.03 to >512 | 64 | 512 | 49.7 |
| Ampicillin-sulbactam | ≤0.03 to 512 | 16 | 64 | 39.1 |
| Piperacillin-tazobactam | ≤0.015 to 256 | 8 | 16 | 2.2 |
| Cefazolin | 0.125 to >128 | 32 | >128 | 54.1 |
| Cefuroxime | 0.5 to >128 | 16 | >128 | 48.6 |
| Cefoxitin | 0.125 to >256 | 4 | 32 | 14.9 |
| Ceftriaxone | ≤0.03 to >256 | 0.25 | 128 | 44.7 |
| Ceftazidime | ≤0.015 to >128 | 0.5 | 32 | 18.3 |
| Cefepime | ≤0.03 to >512 | 1 | 32 | 13.4 |
| Imipenem | ≤0.015 to 1 | 0.125 | 0.25 | 0 |
| Meropenem | ≤0.015 to 1 | 0.06 | 0.125 | 0 |
| Gentamicin | 0.125 to >256 | 16 | 128 | 51.9 |
| Amikacin | ≤0.03 to >256 | 2 | 8 | 6.1 |
| Ciprofloxacin | ≤0.015 to >128 | 4 | 64 | 51.2 |
| Levofloxacin | ≤0.015 to 256 | 4 | 32 | 47.9 |
| Fosfomycin | ≤0.03 to >128 | 1 | 32 | 4.8 |
a
MIC results were interpreted according to CLSI breakpoint criteria 12.