Table 2.
Distribution of 225 samples with respect to the borderline range (0.20–0.70 IU/mL) in Standard E TB-Feron ELISA and QuantiFERON-TB Gold Plus assays.
| Standard E TB-Feron ELISA | QuantiFERON-TB Gold Plus Assay | ||||||||
|---|---|---|---|---|---|---|---|---|---|
| Borderline (0.20–0.70) | Non-Borderline | Borderline (0.20–0.70) | Non-Borderline | ||||||
| No. of Samples | Negative (0.20–0.35) |
Positive (0.35–0.70) |
Negative (<0.20) |
Positive (>0.70) |
Negative 1 (0.20–0.35) | Positive (0.35–0.70) |
Negative (<0.20) |
Indeterminate | Positive (>0.70) |
| HCWs (n = 177) | 17 | 9 | 148 | 3 | 4 | 1 | 172 | 0 | 0 |
| TB Patients (n = 48) | 0 | 5 | 0 | 43 | 5 | 5 | 1 | 1 | 36 |
HCW, healthcare worker; TB, tuberculosis. 1 IFN-γ value of TB1 or TB2 antigen for QFT-Plus–nil within uncertainty zone.