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Consistency of standard laboratory strain Mycobacterium tuberculosis H37Rv with ethionamide susceptibility testing

Drug susceptibility pattern of standard Mycobacterium tuberculosis strain H37Rv showed discrepancy in minimum inhibitory concentration method for ethionamide and consistent results were obtained for the other second line drugs namely, kanamycin and ofloxacin. It is, therefore, necessary to revisit the susceptibility testing method for ethionamide for effective clinical management of patients with drug resistant tuberculosis.