Table 4.
Characteristics of carbapenem-resistant Enterobacteriaceae isolated from clinical surveillance swabs that were negative for blaKPC and blaNDM
| Isolate no. | Panel/method isolated froma: | Species | Ertapenem/meropenem MIC (μg/ml) | Results by: |
Other resistance mechanisms | |
|---|---|---|---|---|---|---|
| Modified Hodge test | blaKPC/blaNDM PCR | |||||
| 1 | Sensitivity panel, CDC-A | Escherichia coli | >4/>8 | Negative | Negative | Unknown mechanism, ESBL phenotype |
| 2 | Sensitivity panel, HC-A | E. coli | >4/≤1 | Negative | Negative | Unknown mechanism, ESBL phenotype |
| 3 | Sensitivity panel, HC-A | E. coli | 1/≤1 | Inhibited (noninterpretable) | Negative | AmpC |
| 4 | Sensitivity panel, HC-A | Enterobacter cloacae complex | 1/≤1 | Positive (ertapenem disk positive, meropenem disk weak positive) | Negative | Unknown mechanism, ESBL phenotype |
| 5 | Sensitivity panel, HC-A | E. coli | >4/8 | Positive (ertapenem and meropenem disks) | Negative | AmpC |
| 6 | Sensitivity panel, HC-A | E. cloacae complex | 1/≤1 | Positive (ertapenem and meropenem disks) | Negative | AmpC |
| 7 | Specificity panel, HC-A | E. coli | >4/2 | Negative | Negative | AmpC |
a
CDC-A, CDC method; HC-A, HardyCHROM ESBL.