Fig 3.

Bayesian phylogenetic tree. A Bayesian tree generated by Geneious (version 4.8.3) software as described in Materials and Methods is depicted. This rooted phylogenetic tree of the fimH sequences of 52 strains (plus the fimH sequences of strains MG1655 and LF82) showed four distinct groups: NT1a, NT1b (NT1a and NT1b were joined into NT1 in the text for SSR analysis), NT2, and NT3. These groups were progressively denoted from higher SSRs to lower ones. Inside each group, depicted with an ellipse, were reported the amino acid mutations found in ≥90% of strains belonging to the group itself. The black circle indicates the root.