Table 2.
Comparison of TaqMan and culture resultsa
| Material(s) | True positives, MTC+/RTP+ | False positives, MTC−/RTP+ | True negatives |
False negatives, MTC+/RTP− | Cases not included |
Total no. (%) | ||||
|---|---|---|---|---|---|---|---|---|---|---|
| MTC−/RTP− | NTM+/RTP− | MTC+/RTPi | MTC−/RTPi | Cont/RTPi | Cont/RTP− | |||||
| Biopsy specimen | 18 | 2 | 208 | 5 | 3 | 2 | 50 | 0 | 0 | 288 (4.7) |
| Bronchial lavage fluid | 35 | 2 | 2,644 | 64 | 16 | 0 | 68 | 0 | 8 | 2,837 (46.8) |
| Cavitary fluidb | 1 | 0 | 153 | 0 | 1 | 0 | 1 | 0 | 0 | 156 (2.6) |
| Gastric aspirate | 6 | 0 | 83 | 0 | 8 | 2 | 1 | 0 | 0 | 100 (1.6) |
| CSFc | 1 | 0 | 228 | 0 | 3 | 0 | 0 | 0 | 0 | 232 (3.8) |
| Pleural fluid | 1 | 0 | 646 | 0 | 10 | 0 | 4 | 0 | 1 | 662 (10.9) |
| Pus | 10 | 0 | 63 | 4 | 3 | 0 | 1 | 1 | 0 | 82 (1.3) |
| Sputum | 114 | 0 | 1,200 | 44 | 12 | 3 | 26 | 0 | 4 | 1,403 (23.1) |
| Urine | 4 | 0 | 243 | 0 | 0 | 0 | 23 | 0 | 0 | 270 (4.4) |
| Other | 1 | 0 | 34 | 2 | 0 | 0 | 0 | 0 | 0 | 37 (0.6) |
| All | 191 | 4 | 5,502 | 119 | 56 | 7 | 174 | 1 | 13 | 6,067 |
a
RTP+, RT-PCR positive; RTP−, RT-PCR negative; RTPi, RT-PCR inhibited; MTC+, culture positive for MTC; MTC−, culture negative for MTC; NTM+, culture positive for NTM and negative for MTC; Cont, culture contaminated.
b
Peritoneal and synovial.
c
CSF, cerebrospinal fluid.