Table A.
Laboratory results for residents with symptoms suggestive of TB
| Site A | Site B | Total | |
|---|---|---|---|
| Chest X-ray | |||
| Active TB | 21 | 28 | 49 |
| Possible TB suspects | 6 | 21 | 27 |
| Old TB based on scar | 38 | 10 | 48 |
| Lung cancer | 3 | 0 | 3 |
| Pneumonia | 16 | 21 | 37 |
| Heart disease | 29 | 1 | 30 |
| Pneumoconiosis | 2 | 0 | 2 |
| Chronic bronchitis and emphysema | 158 | 3 | 161 |
| Other abnormalities | 13 | 8 | 21 |
| Normal | 218 | 132 | 350 |
| Smear* | |||
| Positive | 5† | 2 | 7 |
| 1–8 AFB/300 fields | 3 | 2 | 5 |
| 1+ | 0 | 0 | 0 |
| 2+ | 1 | 0 | 1 |
| 3+ | 1 | 0 | 1 |
| Negative | 499 | 226 | 725 |
| Culture | |||
| M. tuberculosis-positive | 3 | 2 | 5 |
| M. tuberculosis-negative | 495 | 215 | 710 |
| Contaminated | 6 | 6 | 12 |
| Unknown | 0 | 5 | 5 |
| Xpert | |||
| Positive | 5 | 3 | 8 |
| Very low | 3 | 2 | 5 |
| Low | 0 | 1 | 1 |
| Medium | 2 | 0 | 2 |
| Negative | 500 | 225 | 725 |
*
For smear results: 1+=3–9 AFB/100 fields; 2+=1–9 AFB/10 fields; 3+=1–9 AFB/field.
†
Including two false-positive isolates.
TB = tuberculosis; AFB = acid-fast bacilli; Xpert = Xpert® MTB/RIF.