Table 1.
Performance characteristics of 3 media for detection of vancomycin-resistant Enterococcus spp.
| Incubation period | Mediuma | % sensitivity (95% CI)b | % specificity (95% CI) | % PPV (95% CI) | % NPV (95% CI) |
|---|---|---|---|---|---|
| 24 h | Spectra VRE | 98.3 (89.5-100) | 95.2 (87.6-98.5) | 93.4 (83.2-97.9) | 98.8 (92.4-100) |
| BEAV | 86.2 (74.0-93.4) | 91.7 (83.0-96.3) | 87.7 (75.7-94.5) | 90.6 (81.8-95.5) | |
| CAMPY | 96.5 (87.0-99.4) | 91.7 (83.0-96.3) | 88.9 (77.8-95.0) | 97.5 (90.3-99.6) | |
| 48 h | Spectra VRE | 100 (92.3-100) | 95.2 (87.6-98.4) | 93.5 (83.5-97.9) | 100 (94.3-100) |
| BEAV | 96.5 (87.0-99.4) | 84.5 (74.6-91.2) | 81.1 (69.6-89.2) | 97.3 (89.6-99.5) | |
| CAMPY | 100 (92.3-100) | 89.3 (80.2-94.7) | 86.6 (75.5-93.3) | 100 (93.9-100) |
a
BEAV, bile esculin azide agar with 6 μg/ml of vancomycin; CAMPY, Campylobacter agar with 10 μg/ml of vancomycin; PPV, positive predictive value; NPV, negative predictive value.
b
95% CI, 95% confidence interval.