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Table 1 Minimum inhibitory concentration (MIC) for first-line drugs compared to Bactec MGIT results (N = 22 isolates)

From: Application of quantitative second-line drug susceptibility testing at a multidrug-resistant tuberculosis hospital in Tanzania

Drug and MIC result MGIT susceptible MGIT resistant Accuracy
Isoniazid    95.5%
MIC Susceptible 4 0  
MIC Resistant 1 17a  
Rifampin    90.9%
MIC Susceptible 8 1b  
MIC Resistant 1 12c  
Streptomycin    90.9%
MIC Susceptible 13 0  
MIC Resistant 2 7  
Ethambutol    59.1%
MIC Susceptible 11 1e  
MIC Resistant 7f 2  
  1. aAll with isoniazid MIC ≥ 4 μg/ml. bRifampin MIC of 1 μg/ml. cAll with rifampin MIC >16 μg/ml. eEthambutol MIC of 4 μg/ml. fFive (71%) with ethambutol MIC of 8 μg/ml.