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Table 4 Comparison of the in vitro activities of selected antimicrobial agents tested against Acinetobacte spp. a (362 strains)

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

Antimicrobial agent MIC50 MIC90 Range % susceptible / resistantb
 Ceftazidime >16 >32 ≤1 – >16 17.1 / 74.3
 Cefepime 16 >16 ≤0.12 – >16 28.7 / 49.4
 Piperacillin / tazobactam >64 >64 ≤0.5 – >64 16.3 / 77.9
 Imipenem 4 >8 ≤0.12 – >8 52.3 / 36.4
 Meropenem 4 >8 ≤0.12 – >8 52.3 / 37.4
 Ciprofloxacin >4 >4 ≤0.03 – >4 18.2 / 81.2
 Levofloxacin >4 >4 ≤0.5 – >4 18.7 / 78.1
 Gentamicin >8 >8 ≤2 – >8 34.2 / 63.5
 Amikacin >32 >32 ≤4 – >32 22.1 / 64.9
 PolymyxinB ≤0.5 ≤0.5 ≤0.5 – >4 98.6 / 1.4
 Colistin ≤0.5 1 ≤0.5 – >4 98.5 / 1.5
  1. a Includes Acinetobacterbaumannii (295 strains), Acinetobacterhaemolyticus (3 strains), Acinetobacterlwoffii (16 strains), and unspeciated Acinetobacter (48 strains).
  2. b Criteria as published by the CLSI [16].