Table 1.
Performance of two chromogenic agars tested against a panel of 28 diverse enterococci.
| Isolate | Species | van gene | Vancomycin MIC | ST type | ChromID VRE |
Brilliance VRE |
||
|---|---|---|---|---|---|---|---|---|
| 24 hours | 48 hours | 24 hours | 48 hours | |||||
| EC0041 | E. faecium | vanA | >256 | 17 | + | + | + | + |
| EC0179 | E. faecium | vanA | >256 | 64 | + | + | + | + |
| EC0212 | E. faecium | vanA | >256 | 78 | + | + | + | + |
| EC0180 | E. faecium | vanA | >256 | 117 | + | + | + | + |
| EC0115 | E. faecium | vanA | >256 | 202 | + | + | + | + |
| EC0051 | E. faecium | vanA | >256 | 203 | + | + | + | + |
| EC0518 | E. faecium | vanA | >256 | 375 | + | + | + | + |
| EC0220 | E. faecium | vanA | >256 | 412 | + | + | + | + |
| EC0176 | E. faecium | vanA | >256 | 552 | + | + | + | + |
| NCTC12202 | E. faecium | vanA | >256 | 18 | + | + | + | + |
| EC0050 | E. faecalis | vanA | >256 | 103 | + | + | + | + |
| NCTC12201 | E. faecalis | vanA | >256 | 28 | + | + | + | + |
| NCTC12203 | E. faecalis | vanA | >256 | 6 | + | + | + | + |
| EC0109 | E. raffinosus | vanA | >256 | colorless + | colorless + | + | + | |
| VREN1021 | E. hirae | vanA | 128 | + | + | + | + | |
| EC0181 | E. faecium | vanB | >256 | 203 | + | + | very poor | poor |
| NCTC12952 | E. faecium | vanB | 24 | 18 | + | + | very poor | poor |
| NCTC13379 | E. faecalis | vanB | 16 | 6 | + | + | + | + |
| NCTC12362 | E. casseliflavus | vanC | 3 | - | - | - | - | |
| NCTC12360 | E. gallinarum | vanC | 4 | - | - | - | - | |
| NCTC7378 | E. faecium | - | 0.75 | 361 | - | - | - | - |
| EC0439 | E. faecalis | - | 1.5 | 6 | - | - | - | - |
| EC0441 | E. faecalis | - | 1 | 103 | - | - | - | - |
| EC1246 | E. faecalis | - | 1 | 28 | - | - | - | - |
| NCTC8131 | E. faecalis | - | 2 | 21 | - | - | - | - |
| NCTC775 | E. faecalis | - | 0.38 | 25 | - | - | - | - |
| NCTC8175 | E. faecalis | - | 2 | 40 | - | - | - | - |
| NCTC8132 | E. faecalis | - | 2 | 55 | - | - | - | - |
Growth was quantified as + (growth in all four quadrants), poor (scanty growth in more than one quadrant) and very poor (scanty growth on primary inoculum only). Colonial appearance was as per manufacturers’ instructions for E. faecalis and E. faecium. For other species, the colonial morphology was similar to E. faecium unless stated otherwise.
MIC, minimum inhibitory concentration (mg/L).