Table 3. Characteristics of isolates showing discrepant phenotypic results with genotypic results.
| Organism | Carbapenemase | NG-Test CARBA5 result | mCIM result | eCIM result | MIC (μg/mL) | ||
|---|---|---|---|---|---|---|---|
| Imipenem | Meropenem | Ertapenem | |||||
| Enterobacter cloacae | IMP-4 | IMP+NDM | + | + | 8 (R) | 16 (R) | 64 (R) |
| Serratia marcescens | VIM-2 | VIM | − | − | >256 (R) | >256 (R) | >256 (R) |
| Enterobacter cloacae | KPC-2+IMP-4 | KPC+IMP | + | − | 16 (R) | 64 (R) | 16 (R) |
| Klebsiella oxytoca | KPC-2+IMP-4 | KPC+IMP | + | − | 32 (R) | 32 (R) | 64 (R) |
mCIM, modified carbapenem inactivation method in conjunction; eCIM, EDTA carbapenem inactivation method; IMP, imipenemase; VIM, Verona integron-encoded metallo-beta-lactamase; KPC, Klebsiella pneumoniae carbapenemase; NDM, New Delhi metallo-β-lactamase; R, resistant.