Table 1: yield of bronchoscopic samples
| Sample | N (%) | Positive Zhiel | Positive Culture |
| Bronchial aspirate (BAS) | 42 (100%) | 2 (5%) | 19 (45%) |
| Lavage bronchoalveolar (BAL) | 14 (33%) | 2 (14%) | 9 (64%)* |
| Brush | 4 (9,5%) | 0 | 1 (25%)* |
| Transbronchial biopsy | 25 (59,5%) | 22 (88%) necrotizing granulomas: 5 (20%) Ziehl-Neelsen stain positive and 17 (68%) Ziehl-Neelsen stain negative | |
*All had positive culture in bronchial aspirate