Table 1.

Results of phase I generated by the six study sites in AST of 10 susceptible strains of M. tuberculosis

Antimicrobial agentBACTEC 460 mediumMiddlebrook 7H10 agar
Inhibitory concn (μg/ml)Count (%)aInhibitory concn (μg/ml)Count (%)
Capreomycin≤1.2559 (98.3)10.059 (98.3)
2.51 (1.7)
Cycloserine≤5027 (45)25.036 (60)
60.023 (38.3)
70.09 (15)
>70.01 (1)
Ethionamide≤1.2559 (98.3)5.059 (98.3)
2.51 (1.7)
Kanamycin≤1.2548 (80)5.060 (100)
2.512 (20)
Amikacin≤1.060 (100)≤2.054 (90)
>4.06 (10)
Clofazimine≤0.2559 (98.3)≤0.2547 (78.3)
0.51 (1.7)0.513 (21.7)
Ciprofloxacin≤0.546 (76.7)≤0.541 (68.3)
1.013 (21.7)1.018 (30)
2.01 (1.7)2.01 (1.7)
Ofloxacin≤0.521 (35)≤0.519 (31.7)
1.034 (56.7)1.038 (63.3)
2.04 (6.7)2.03 (5)
>4.01 (1.7)
  • a The count is the total number of susceptible strains.