Percentage of spores within colonies collected after 48 h of growth on TY agar containing different sub-MIC concentrations of TIGE, TZP, CIP, VAN, or MTZ. No ATB = control without antibiotic. Values represent the means ± standard error of the mean of three independent experiments. Each condition was compared to the control without antibiotics using one-way ANOVA and asterisks indicate the means that were statistically different. Statistical significance: * = p < 0.05, ** = p < 0.01, *** = p < 0.001 and **** = p < 0.0001.