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Table 3 Comparison of the in vitro activities of selected antimicrobial agents tested against Pseudomonas aeruginosa (404 strains)

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

Antimicrobial agent MIC50 MIC90 Range % susceptible / resistanta
 Ceftazidime 2 >16 ≤1 – >16 71.7 / 24.0
 Cefepime 4 16 0.5 – >16 77.9 / 9.9
 Piperacillin/tazobactamb 8 >64 ≤0.5 – >64 68.8 / 15.5
 Imipenem 2 >8 ≤0.12 – >8 74.9 / 17.8
 Meropenem 0.5 >8 ≤0.12 – >8 76.4 / 12.8
 Ciprofloxacin 0.25 >4 ≤0.03 – >4 75.2 / 20.0
 Levofloxacin ≤0.5 >4 ≤0.5 – >4 74.2 / 24.0
 Gentamicin ≤2 >8 ≤2 – >8 64.1 / 31.9
 Amikacin 4 >32 ≤4 – >32 70.3 / 23.7
 PolymyxinB  1 1 ≤0.5 – 2 100.0 / 0.0
 Colistin 1 2 ≤0.5 – 2 100.0 / 0.0
  1. a Criteria as published by the CLSI [16].
  2. b Criteria published by the CLSI [15].