Molecular Phylogenetic analysis of APEC (n = 76) and human ExPEC (n = 53) based on concatenated MLST alleles.

<p>The evolutionary history was inferred by using the Maximum Likelihood method based on the Tamura-Nei model <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105016#pone.0105016-Tamura1" target="_blank">[22]</a>. The tree with the highest log likelihood is shown. Circles represent APEC strains and triangles human ExPEC strains. Black geometrical shapes indicate that strains belonged to the major cluster A and white ones show that they are contained in major cluster B (see <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105016#pone-0105016-g001" target="_blank">Figure 1</a> for more details).