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Sputum culture results in patients with negative sputum smears
| No. pos sputum cultures | Quantitative sputum culture result | |||
| < 20 CFU | 20–100 CFU | > 100 CFU | Total | |
| 1 | 22 | 6 | 2 | 30* |
| 2 | 6 | 3 | 3 | 12 |
| 3 | 1 | 3 | 0 | 4 |
| Total number | 29 | 12 | 6 | 46 |
* 31 patients had one culture positive slant; however growth on one slant could not be estimated
