TABLE 2.
Time to detection of M. tuberculosis and NTM that grew both on LJ medium and in MB Redox
| Specimen with positive culture | Mean days to detection (range)a | No. (%) of positive cultures detected by day:
|
|||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| 7 | 11 | 14 | 18 | 21 | 25 | 28 | 35 | 42 | 49 | 56 | >56 | ||
| MB Redox | |||||||||||||
| M. tuberculosis | 23.6* (11–49) | 0 (0) | 1 (6.3) | 3 (18.8) | 4 (25) | 8 (50) | 12 (75) | 12 (75) | 13 (81.2) | 15 (93.8) | 16 (100) | ||
| AFB positive | 17 (11–22) | 0 | 1 | 3 | 3 | 7 | 8 | 8 | 8 | 8 | 8 | ||
| AFB negative | 30.1 (17–49) | 0 | 0 | 0 | 1 | 1 | 4 | 4 | 5 | 7 | 8 | ||
| NTM | 32.3** (11–90) | 0 (0) | 2 (14.3) | 4 (29.6) | 4 (29.6) | 6 (42.8) | 7 (50) | 9 (64.3) | 9 (64.3) | 10 (71.4) | 11 (78.6) | 13 (92.8) | 14 (100) |
| LJ medium | |||||||||||||
| M. tuberculosis | 28.9* (14–56) | 0 (0) | 0 (0) | 1 (6.3) | 3 (18.8) | 6 (37.5) | 8 (50) | 8 (50) | 13 (81.3) | 14 (87.5) | 15 (93.8) | 16 (100) | |
| AFB positive | 20.5 (14–33) | 0 | 0 | 1 | 3 | 5 | 7 | 7 | 8 | 8 | 8 | 8 | |
| AFB negative | 37 (21–56) | 0 | 0 | 0 | 0 | 1 | 1 | 1 | 5 | 6 | 7 | 8 | |
| NTM | 40.6** (15–85) | 0 (0) | 0 (0) | 0 (0) | 3 (21.4) | 4 (28.6) | 5 (35.7) | 5 (35.7) | 7 (50) | 8 (57.1) | 9 (64.3) | 12 (85.7) | 14 (100) |
a
*, P = 0.29; **, P = 0.44.