Relative expression of the adeB and adeJ genes from strains of the PFGE-ROC-1OXA-58 clone in relation to the MICs of different antibiotics.*, P < 0.05 (Student's t test). Light gray bars, strains susceptible to several antibiotics (grouped by MIC [in mg/liter]); dark gray bars, strains resistant to several antibiotics (grouped by MIC [in mg/liter]); TIG, tigecycline; GEN, gentamicin; AMK, amikacin; DOX, doxycycline; MIN, minocycline; NET, netilmicin; RIF, rifampin; TOB, tobramycin.