Table 1. Characteristics of 752 children exposed to index tuberculosis patients, index patients, and index case Mycobacterium tuberculosis isolates, Houston, Texas, USA, 2007–2017.
| Characteristic | Value* |
|---|---|
| Demographics | |
| Age, y, median (interquartile range) | 2.4 (1.2–3.6) |
| Sex | |
| F | 380 (50.5) |
| M | 372 (49.5) |
| Race/ethnicity | |
| Hispanic | 493 (65.6) |
| Black | 141 (18.8) |
| Asian | 78 (10.4) |
| White | 30 (4.0) |
| Biracial | 10 (1.3) |
| Residing in home of index patient | |
| Yes | 311 (41.4) |
| No |
441 (58.6) |
| Index patient microbiology | |
| Acid-fast bacilli smear positive | 513 (68.2) |
| Acid-fast bacilli culture positive |
680 (90.4) |
| Index isolate drug susceptibilities, n = 680 | |
| Isoniazid and rifampin susceptibility | 635 (93.4) |
| Isoniazid resistance† | 32 (4.7) |
| Isoniazid and rifampin resistance | 13 (1.9) |
| Rifampin monoresistance |
1 (0.1) |
| Index patient sample used for culture | |
| Sputum | 637 (84.7) |
| Bronchoalveolar lavage | 93 (12.4) |
| Lung biopsy | 11 (1.5) |
| Pleural fluid | 11 (1.5) |
*Values are no. (%), except where specified. Percentages might not sum up to 100% because of rounding. †Seven isolates were resistant to isoniazid and streptomycin, and 5 were resistant to isoniazid and ethambutol; the remainder of isolates had isoniazid monoresistance.