Table 3.
IFN-γ values and active TB exposure history for 11 HCWs with discordant results between Standard E TB-Feron ELISA (positive) and QuantiFERON-TB Gold Plus assays (negative).
| No. | Standard E TB-Feron ELISA | Previous Active TB Treatment History | TB Exposure History of within 2 Years | |||
|---|---|---|---|---|---|---|
| Primary Test | Resampling Test | |||||
| TB–nil (IU/mL) | Result | TB–nil (IU/mL) | Result | |||
| 1 | 0.40 | Positive | 0.24 | Negative | No | Yes |
| 2 | 0.35 | Positive | 0.36 | Positive | No | No |
| 3 | 0.80 | Positive | 0.22 | Negative | No | Yes |
| 4 | 0.39 | Positive | 0.20 | Negative | No | No |
| 5 | 0.95 | Positive | 0.94 | Positive | No | Yes |
| 6 | 0.43 | Positive | 0.32 | Negative | No | Yes |
| 7 | 0.58 | Positive | 0.03 | Negative | No | Yes |
| 8 | 0.72 | Positive | 0.74 | Positive | No | No |
| 9 | 0.39 | Positive | 0.10 | Negative | No | Yes |
| 10 | 0.39 | Positive | 0.46 | Positive | No | Yes |
| 11 | 0.68 | Positive | ND | No | No | |
HCW, healthcare worker; ND, not done.