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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