Table 1.
Characteristics of tuberculosis (TB) case contacts who were purified protein derivative (PPD) enzyme-linked immunospot (ELISPOT) positive divided into subgroups of double-positives, those that have strong evidence of recent Mycobacterium tuberculosis infection (TST ≥ 10 mm and ESAT-6/CFP-10-ELISPOT positive) and double-negatives, those least likely to have recent M. tuberculosis infection (TST = 0 mm, ESAT-6/CFP-10-ELISPOT negative).
| Characteristics | Double-positive (n = 199) | Double-negative (n = 183) | P-value |
|---|---|---|---|
| Mean (median : range) age (years) | 20·4 (18; 0·5–80) | 18·9 (15; 0·5–89) | 0·38 |
| Male, n (%) | 88 (44·2) | 76 (41·5) | 0·60 |
| Ethnic group, n (%) | |||
| Mandinka | 41 (20·6) | 61 (33·3) | |
| Jola | 53 (26·6) | 39 (21·3) | |
| Wolof | 32 (16·1) | 31 (16·9) | |
| Fula | 22 (11·1) | 15 (8·2) | |
| Other | 51 (25·6) | 37 (20·2) | 0·062 |
| BCG scar present, n (%) | 77 (38·7) | 84 (45·9) | 0·15 |
| HIV positive, n (%)a | 3 (1·5) | 5 (2·7) | 0·41 |
BCG: bacille Calmette–Guérin; HIV: human immunodeficiency virus
a
n = 380 tested.