Table 1.
Detection of KPC-producing strains
| Basis of analysis and category | No. (%) positive KPC-producing strains (n = 77) by: |
|
|---|---|---|
| BD Phoenix | Vitek 2 | |
| MIC analysis | ||
| Any carbapenem MIC ≥2 μg/ml | 75 (97) | 75 (97) |
| Ertapenem MIC ≥2 μg/ml | 72 (94) | 67/75 (92)a |
| Imipenem MIC ≥2 μg/ml | 37 (48) | Not tested |
| Meropenem MIC ≥2 μg/ml | 23 (30) | 75 (97) |
| Interpretive comments by experts | ||
| Elevated carbapenem MIC | 72 (94) | 68 (88) |
| Possible carbapenemase | 44 (57) | 63 (82) |
a
The results of 67/75 (92%) apply to Enterobacteriaceae only because the Vitek 2 test did not report ertapenem MICs for P. aeruginosa (no CLSI breakpoints for this drug/organism combination).