Table 2 Sensitivity and specificity of HIV testing on sputum at various days, with and without CPC
HIV serum ELISA (Standard) | ||||
|---|---|---|---|---|
HIV on sputum | Positive | Negative | Sensitivity (95% CI) | Specificity (95% CI) |
Day 1 | 94.7% (89.4–97.8%) | 92.9% (88.9–95.8%) | ||
Positive | 125 | 7 | ||
Negative | 7 | 233 | ||
Total | 132 | 240 | ||
Without CPC | ||||
Day 4 | 93.2% (87.5–96.8%) | 76.7% (70.9–81.9%) | ||
Positive | 123 | 56 | ||
Negative | 9 | 185 | ||
Total | 132 | 241 | ||
Day 7 | 92.9% (87.0–96.7%) | 62.7% (55.5–69.5%) | ||
Positive | 118 | 72 | ||
Negative | 9 | 121 | ||
Total | 127 | 193 | ||
With CPC | ||||
Day 4 | 93.9% (87.3–97.7%) | 67.8% (60.4–74.5%) | ||
Positive | 93 | 58 | ||
Negative | 6 | 122 | ||
Total | 99 | 180 | ||
Day 7 | 94.9% (87.5–97.9%) | 49.6% (40.5–58.7%) | ||
Positive | 94 | 63 | ||
Negative | 5 | 62 | ||
Total | 99 | 125 | ||