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Difference in IFN-γ level between TB2 and TB1 ([TB2-TB1] > 0.6 IU/mL) based on TB infection risk in subjects with QFT-PLUS–positive results (n = 44)
| TB2-TB1, IU/mL | Active TB/TB contact | Biologic therapy/other diseases | Total |
|---|---|---|---|
| > 0.6 | 5 | 4 | 9 |
| ≤ 0.6 | 14 | 21 | 35 |
| Total | 19 | 25 | 44 |
IFN-γ, interferon-γ; TB, tuberculosis; QFT-PLUS, QuantiFERON-TB Gold Plus.
