Table 3. Real-time PCR result distribution according to the specimen (N = 333).
| Specimen | Real-time MTB PCR positive* | Real-time PCR NTM positive | Negative** | Total | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| AFB stain | Neg | 1+ | 2+ | 3+ | 4+ | total | Neg | 1+ | 2+ | 3+ | 4+ | total | Neg | ||
| Pulmonary | Bronchial washing | 17(16)† | 9(8) | 2 | 2 | 30(28) | 10 | 5(4) | 7(6) | 3 | 25(23) | 52 | 107(103) | ||
| Sputum | 19(18) | 5 | 2(1) | 1 | 2 | 29(27) | 79(73) | 3 | 6(5) | 3 | 4(3) | 95(87) | 33(32) | 157(146) | |
| Total | 36(34) | 14(13) | 4(3) | 1 | 4 | 59(55) | 89(83) | 8(7) | 13(11) | 3 | 7(6) | 120(110) | 85(84) | 264(249) | |
| Extrapulmonary | Cerebrospinal fluid | 0 | 0 | 14(13) | 14(13) | ||||||||||
| Joint or bone aspiration | 1 | 1 | 1 | 1 | 10 | 12 | |||||||||
| Pleural fluid or ascites | 1 | 1 | 1 | 1 | 23(22) | 25(24) | |||||||||
| Lymph node or tissue biopsy | 6(5) | 6(5) | 0 | 1 | 7(6) | ||||||||||
| Pus | 3(2) | 2(1) | 5(3) | 0 | 4 | 9(7) | |||||||||
| Urine | 0 | 0 | 1 | 1 | |||||||||||
| Stool | 0 | 1 | 1 | 0 | 1 | ||||||||||
| Total | 11(9) | 2(1) | 0 | 0 | 0 | 13(10) | 2 | 1 | 0 | 0 | 0 | 3 | 53(51) | 69(64) | |
*Total 19 of TB PCR positive samples showed no growth in TB culture results.
** All of these samples showed negative for AFB stain and no growth for TB culture results.
†In case of duplicate collection, the number of patients were indicated in parentheses.
Abbreviations: Neg, negative; MTB, Mycobacterium tuberculosis; AFB, acid fast bacilli; NTM, Non-tuberculosis Mycobacterium.