Growth inhibitory effect of azoles on M. avium. Econazole, ketoconazole, itraconazole, and voriconazole were tested from 0 to 16 μg/ml, and fluconazole was tested from 0 to 64 μg/ml. Econazole was found to have a minimum inhibitory concentration (MIC) of 4 μg/ml and a minimum bacteriocidal concentration (MBC) of 4 μg/ml, whereas ketoconazole had an MIC of 8 μg/ml and an MBC of 16 μg/ml. Itraconazole, voriconazole, and fluconazole did not inhibit MAC growth to any significant extent.