Fig. 7: Phylogenetic tree for all Shigella and E. coli O-antigen gene clusters.

The Shigella O-antigen gene clusters (rfb) characterised in this study are indicated by an asterisk. Nodes supported by bootstrap values ≥95% are indicated by red dots. S. boydii rfb genes are shown in green, S. dysenteriae rfb genes are shown in orange, S. flexneri rfb genes are shown in blue, and S. sonnei rfb genes are shown in red. The scale bar indicates the number of nucleotide substitutions per variable sites.