Colony morphology was analyzed on Luria-Bertani (LB) agar without salt and supplemented with Congo Red (40 g/mL) and Coomassie brilliant blue (20 g/ mL), using Congo Red assay according to Malcova et al., [29]. Colony morphology was determined after 96h incubation at 25°C and 37°C. The experiment was repeated on three separate occasions.