Comparison of three recent European studies
| Study authors | Zellweger et al9 | Sloot et al10 | Hermansen et al7 |
| Population screened | Close contacts (n=5020) | Close contacts (n=4774) | Mixed, nationwide (n=15 980) |
| IGRA positive, n (%) | 1367 (27) | 739 (16) | 1703 (10.7) |
| CP given in IGRA pos, n (%) | 971 (58%) | 309 (45%) | Not known |
| Incident TB | |||
| IGRA pos, no CP (%) | 3.5 | 2.7 | – |
| IGRA pos, with CP (%) | 0.4 | 1.2 | – |
| IGRA pos (%) | – | – | 1.3 |
| IGRA neg (%) | 0.15 | 0.09 | 0.14 |
CP, chemoprophylaxis; IGRA, interferon-γ release assay; neg, negative; pos, positive.