Mean genetic distances within (boldface values) and between phylogroups.

a<p>Distances based on 1854 bp sequences of four housekeeping genes are those used for constructing the MLST tree of the set of 216 strains in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0105547#pone-0105547-g001" target="_blank">Figure 1</a>.</p><p>Mean genetic distances within (boldface values) and between phylogroups.</p>