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Table 5 Comparison of the in vitro activities of selected antimicrobial agents tested against Enterobacterspp . a (214 strains)

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

Antimicrobial agent MIC50 MIC90 Range %susceptible / resistantb
 Ceftriaxone 0.25 >32 ≤0.25 – >32 59.3 / 39.2
 Ceftazidime ≤1 >16 ≤1 – >16 62.6 / 34.5
 Cefepime ≤0.12 8 ≤0.12 – >16 92.1 / 3.7
 Piperacillin / tazobactam 2 >64 ≤0.5 – >64 73.8 / 26.1
 Imipenem 0.5 1 ≤0.12 – 8 98.6 / 0.0
 Meropenem ≤0.12 0.12 ≤0.12 – 4 100.0 / 0.0
 Ciprofloxacin ≤0.03 >4 ≤0.03 – >4 85.0 / 14.0
 Levofloxacin ≤0.5 >4 ≤0.5 – >4 87.4 / 12.6
 Gentamicin ≤2 >8 ≤2 – >8 81.3 / 18.6
 Amikacin 2 >32 ≤4 – >32 82.7 / 16.3
 PolymyxinB ≤0.5 >4 ≤0.5 – >4 - / -
 Colistin ≤0.5 >4 ≤0.5 – >4 - / -
  1. a Includes Enterobacteraerogenes (38 strains), Enterobacteramnigenus (2 strains), Enterobactercancerogenus (1 strain), Enterobacter cloacae (161 strains), Enterobactergergoviae (6 strains), Enterobactersakazakii (4 strains), and unspeciated Enterobacter (2 strains).
  2. b Criteria as published by the CLSI [16].