| Quantiferon test | PPD (+) | PPD (−) | Total |
| Positive | 26 (36.6%) | 45 (63.3%) | 71 |
| Negative | 0 | 15 (100%) | 15 |
| Intermediate | 2 (10%) | 18 (90%) | 20 |
| Total | 28 (26.4%) | 8 (73.5%) | 106 |