TABLE 2.
Comparison of the operating characteristics of rapid xylose and MDG fermentation tests for enterococcal isolates
| Method | No. of indicated results for:
|
Test operating characteristic
|
||||||
|---|---|---|---|---|---|---|---|---|
|
E. gallinarum (n = 55)
|
E. faecium (n = 91)
|
E. faecalis (n = 10)
|
||||||
| Positive | Negative | Positive | Negative | Positive | Negative | Sensitivity (%) | Specificity (%) | |
| Rapid xylose test (2 h) | 54 | 1 | 1 | 90 | 0 | 10 | 98 | 99 |
| MDG test, standard (24 h) | 55 | 0 | 3 | 88 | 2 | 8 | 100 | 95 |
| MDG test, accelerated | ||||||||
| 2 h | 9 | 46 | 0 | 91 | 1 | 9 | 16 | 99 |
| 3 h | 9 | 46 | 0 | 91 | 1 | 9 | 16 | 99 |
| 4 h | 26 | 29 | 0 | 91 | 1 | 9 | 47 | 99 |
| 18 h | 52 | 3 | 0 | 91 | 5 | 5 | 95 | 95 |
| 24 h | 54 | 1 | 4 | 87 | 7 | 3 | 98 | 89 |