Table 2.

Time to detection of M. tuberculosis and NTM that grew both on LJ medium and in MB Redox

Specimen with positive cultureMean days to detection (range)aNo. (%) of positive cultures detected by day:
711141821252835424956>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 positive17 (11–22)0133788888
  AFB negative30.1 (17–49)0001144578
 NTM32.3** (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 positive20.5 (14–33)00135778888
  AFB negative37 (21–56)00001115678
 NTM40.6** (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.