Table 3.

Performance of Wider system susceptibility testing with routine Enterobacteriaceae isolatesa

Antimicrobial agentb% MICs obtained with Wider system within indicated log2 reference MIC:% Essential Agreement% Errors
>−2−2−10+1+2>+2miMVM
Ampicillin (138)0.00.02.197.80.00.00.0100.00.70.00.0
Amoxicillin-clavulanate (138)0.00.77.985.53.61.40.797.15.11.00.0
Ticarcillin (138)1.40.73.693.50.70.00.097.83.60.00.0
Cefazolin (138)1.40.70.793.52.21.40.096.42.90.06.6
Cefuroxime (138)0.01.42.892.02.10.70.797.13.60.00.0
Cefoxitin (138)0.00.00.794.24.30.70.099.32.20.00.0
Cefotaxime (138)0.01.40.092.05.70.70.097.8NANANA
Ceftazidime (138)0.00.00.093.55.11.40.098.50.70.00.0
Aztreonam (138)1.40.72.285.56.52.90.794.20.70.733.3
Cefepime (138)0.02.12.990.62.90.70.796.40.70.00.0
Meropenem (138)0.00.00.098.51.40.00.0100.00.00.00.0
Imipenem (138)0.00.72.171.011.05.89.484.01.40.70.0
Gentamicin (138)0.00.01.495.00.72.90.097.10.00.00.0
Tobramycin (138)0.00.70.794.22.81.40.097.84.30.00.0
Amikacin (138)0.70.02.892.02.81.40.097.8NANANA
Nalidixic acid (138)0.00.00.097.10.72.10.097.80.00.00.0
Ciprofloxacin (138)0.00.02.285.54.30.77.292.00.70.90.0
Co-trimoxazole (138)0.00.00.094.92.12.90.097.10.04.80.0
 Total (2,484)0.30.51.891.83.21.51.196.61.70.50.9

  • ↵a Abbreviations: NA, not applicable; mi, minor error; M, major error; VM, very major error.

  • ↵b Values in parentheses are the number of organism-antimicrobial agent combinations tested.