TABLE 2.
Sensitivity and specificity analysis of chromID VRE and EVA for VRE at 48 h
| Medium | No. of resultsa
|
Sensitivity
|
Specificity
|
|||
|---|---|---|---|---|---|---|
| TP | FN | % | 95% CI | % | 95% CI | |
| chromID VRE | 32 | 1 | 96.9 | 84.3-99.5 | 99.4 | 98.1-99.8 |
| EVA | 31 | 2 | 93.9 | 80.1-98.4 | 83.4 | 79.1-86.6 |
a
A true positive (TP) is defined as a blue-green or purple colony on chromID VRE or a brown to black colony on EVA that was identified as VRE by VITEK 2 and confirmed by PCR. A false negative (FN) is defined as an isolate that was confirmed as a VRE on one medium but did not grow on the other medium.