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Agreement between the in vitro measurement of IFN-γ with M. tuberculosis subfraction stimulation using the Q-IFN kit and PPD-ST induration
| Tuberculin subfraction | PPD-ST resulta | Median % IFN-γ response | Interquartile range |
|---|---|---|---|
| LMWCFP | + | 13.6 | 101.0 |
| − | 3.6 | 10.0 | |
| CFP-LAM | + | 20.3 | 120.4 |
| − | 7.0 | 18.4 | |
| SCWP | + | 22.8 | 108.2 |
| − | 8.7 | 42.4 | |
| CYT | + | 25.6 | 82.9 |
| − | 2.0 | 10.6 | |
| H37Rv PPD | + | 8.2 | 74.0 |
| − | 0.6 | 4.8 |
n = 20 for both positive and negative PPD-ST groups. Plus, positive; minus, negative.
