Fig. 7

Host factors modulate stx2a expression levels. (a) Whole genomes of 14 O157:H7 strains with PST1-1 were aligned using Mugsy [44] and the phylogenetic tree was inferred using RaxML [45] with 100 bootstrap replicates and visualized using Figtree [88]. (b) Stx2 production was quantified by ELISA 2 h after ciprofloxacin induction. Bars labeled with different letters were significantly different (P < 0.05)