TABLE 1.
Comparison of the Cobas TaqMan MTB test and culture results stratified by AFB smear gradea
| Smear grade | No. with culture result: |
No. with Cobas TaqMan MTB test result: |
Total no. | ||
|---|---|---|---|---|---|
| Positive | Total negative (no growth/NTM) | Positive | Negative | ||
| Negative | 159 | 6,371 (5,828/543) | 99 | 6,431 | 6,530 |
| No AFB seen | 125 | 6,265 (5,791/484) | 63 | 6,327 | 6,390 |
| Trace | 34 | 106 (47/59) | 36 | 104 | 140 |
| Positive | 110 | 132 (9/123) | 113 | 129 | 242 |
| 1+ | 61 | 82 (6/76) | 62 | 81 | 143 |
| 2+ | 17 | 25 (2/23) | 19 | 23 | 42 |
| 3+ | 13 | 15 (0/15) | 13 | 15 | 28 |
| 4+ | 19 | 10 (1/9) | 19 | 10 | 29 |
| Total | 269 | 6,503 (5,837/666) | 212 | 6,560 | 6,772 |
a
AFB, acid-fast bacilli.