FIGURE 4.

Fold change in adeIJK promoter activity in the three strains included in the study calculated at 6 h (exponential phase) and 24 h (stationary phase) in the presence of subinhibitory concentrations of antibiotics. The Fold-change represents the difference in luminescence. Values > 1 are considered as increased expression and values < 1 as decreased expression. Values = 1 represent no changes in gene expression. There is no representation of groups with no growth (OD₆₀₀ < 0.02). Brackets represent significant differences between treatments; *p < 0.05, **p < 0.01 and ***p < 0.001. Colistin (COL), meropenem (MEM), rifampicin (RIF), tigecycline (TGC), chlorhexidine (CLX), and ethanol (EtOH).