Results of screening contacts of all active patients with TB seen during 2015 at Northwick Park Hospital, London
| Pulmonary TB | Extrapulmonary TB | All patients | |
|---|---|---|---|
| Number of active cases | 91 | 98 | 189 |
| Mean age of active cases (SD) | 41.8 (SD 22.0) | 39.3 (SD 15.9) | 40.5 (SD 19.1) |
| Total number of screened contacts | 399 | 299 | 698 |
| Mean number of screened contacts per index case (SD) | 4.4 (SD 6.3) | 3.1 (SD 2.3) | 3.7 (SD 4.7) |
| Number of contacts diagnosed with latent TB, N (%) | 108 (27.1) | 31 (10.4) | 139 (19.9) |
| Number of contacts diagnosed with active TB, N (%) | 8 (2) | 1 (0.3) | 9 (1.3) |
| Number of contacts treated for latent TB, N (%) | 83/108 (76.9) | 23/31 (74.2) | 106/139 (76.3) |
| Number of contacts who declined latent TB treatment, N (%) | 25/108 (23.1) | 8/31 (25.8) | 33/139 (23.7) |
| Number of contacts who failed to attend screening, N (%) | 41/399 (10.3) | 45/299 (15.1) | 86/698 (12.3) |
| Number of contacts whose outcome is not available, N (%) | 23/399 (5.8) | 7/299 (2.3) | 30/698 (4.3) |