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Table 1 Comparison of the in vitro activities of selected antimicrobial agents tested against Escherichia coli (563 strains)

From: Resistance trends in gram-negative bacteria: surveillance results from two Mexican hospitals, 2005–2010

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
  1. a Criteria as published by the CLSI [16].
  2. bPseudomonas aeruginosa breakpoints.