TABLE 2.

MICs and error rates obtained for 107 isolates of the Acinetobacter baumannii-calcoaceticus complex tested for susceptibility to three aminoglycosides by six methods

Drug and methodMIC (μg/ml)% SaVMEb (%)MEc (%)mEd (%)
50%90%
Amikacin
    DDe16.80.900
    ETf128≥25616.80.900
    MicroScan≥32≥3215.90.90.90
    Phoenix≥32≥3221.55.6013.1
    Vitek 2≥16≥6453.336.4013.1
    BMDg128≥25616.8
Gentamicin
    DD4.7000
    ET≥256≥2564.7000
    MicroScan≥8≥84.7000
    Phoenix≥8≥85.600.90
    Vitek 2≥16≥164.8008.4
    BMD≥32≥324.7
Tobramycin
    DD27.12.81.93.7
    ET24≥6428.02.81.90
    MicroScan≥8≥827.11.92.84.7
    Phoenix≥8≥830.85.60.94.7
    Vitek 28≥1643.813.10.023.4
    BMD≥32≥3227.1
  • a S, susceptible.

  • b VME, very major error.

  • c ME, major error.

  • d mE, minor error.

  • e DD, disk diffusion.

  • f ET, Etest.

  • g BMD, broth microdilution.