INHA and tuberculosis: We also looked further into the resistance patterns of MDR-TB isolates using genotypic methods in the following mutations: rifampicin (rpoB), isoniazid (inhA or katG), ethambutol (embB), pyrazinamide (pncA), ofloxacin (gyrA), amikacin (rrs or eis), and ethionamide (inhA).5 The results were compared with MICs, which showed a good correlation to the drugs tested.