Table 3

Performance of the colistin Etest on MHA manufactured by BBL, Hardy, and Remel compared to results obtained with BMD-T during phase I testing

OrganismNo. of isolatesNo. of resistant isolatesa% CAb% EAbNo. of MEsb (%)No. of VMEsb (%)
BBLHardyRemelBBLHardyRemelBBLHardyRemelBBLHardyRemel
A. baumannii11381647227375501 (12.5)1 (12.5)2 (66)3 (100)2 (66)
K. pneumoniae1598080803367660003 (33)3 (33)3 (33)
P. aeruginosa2438392926379792 (9.5)002 (66)2 (66)2 (66)
All isolates50157878844664682 (5.7)1 (2.8)1 (2.8)7 (47)8 (53)7 (47)
  • a Isolates were designated resistant based on the MIC obtained by BMD-T. An MIC of ≥4 μg/ml was considered resistant.

  • b CA, categorical agreement; EA, essential agreement; MEs, major errors; VMEs, very major errors.