Table 1 Comparison of the in vitro activities of selected antimicrobial agents tested against Escherichia coli (563 strains)
Antimicrobial agent | MIC50 | MIC90 | Range | % susceptible/resistanta |
|---|---|---|---|---|
Cefuroxime | 8 | >16 | ≤2 – >16 | 55.2 / 43.2 |
Cefoxitin | 4 | >16 | ≤4 – >16 | 74.9 / 13.7 |
Ceftriaxone | ≤0.25 | >32 | ≤0.25 – >32 | 56.8 / 41.7 |
Ceftazidime | ≤1 | >16 | ≤1 – >16 | 61.6 / 33.2 |
Cefepime | 0.25 | >16 | ≤0.12 – >16 | 71.4 / 19.9 |
Piperacillin/tazobactam | 4 | 32 | ≤0.5 – >64 | 83.1 / 3.9 |
Imipenem | ≤0.12 | 0.25 | ≤0.12 – 1 | 100.0 / 0.0 |
Meropenem | ≤0.12 | ≤0.12 | ≤0.12 – 0.5 | 100.0 / 0.0 |
Ciprofloxacin | >4 | >4 | ≤0.03 – >4 | 41.7 / 57.9 |
Levofloxacin | >4 | >4 | ≤0.5 – >4 | 41.7 / 56.7 |
Gentamicin | ≤2 | >8 | ≤2 – >8 | 67.1 / 31.9 |
Amikacin | ≤4 | 8 | ≤4 – >32 | 95.7 / 0.4 |
PolymyxinBb | ≤0.5 | ≤0.5 | ≤0.5 – 1 | 100 / 0.0 |
Colistinb | ≤0.5 | ≤0.5 | ≤0.5 – 2 | 99.8 / 0.2 |