Table 2 Relation of colony forming units (CFUs) on culture to sensitivity of smear microscopy in 212 sputum samples
From: Sputum microscopy for the diagnosis of HIV-associated pulmonary tuberculosis in Tanzania
Quantitative sputum smear results | |||||||
|---|---|---|---|---|---|---|---|
Quantitative sputum culture results | < 10 afb/100 field | 1+ (10–99afb/100 field) | 2+ (1–10 afb/field) | 3+ (> 10 afb/field) | Neg | Total | SM pos % |
< 20 CFU | 4 | 6 | 1 | 1 | 41 | 53 | 22.6 |
1+ (20–100 CFU) | 8 | 15 | 4 | 4 | 31 | 62 | 50 |
2+ (> 100 CFU with discrete innumerable colonies) | 5 | 11 | 4 | 3 | 5 | 28 | 82.1 |
3+ (> 100 CFU with confluent innumerable colonies) | 7 | 17 | 15 | 26 | 4 | 69 | 94.2 |
Total | 24 | 49 | 24 | 34 | 81 | 212 | 61.8 |