Maximum Likelihood tree of 119 <i>E. coli</i> strains.

<p>Tree is shown in the rectangular cladogram format, but readers are reminded that this is an unrooted tree. Genomes consisting of raw reads are labeled in blue. Numbers at the internal nodes indicate the number of alleles that are shared exclusively by the descendants of each node. Zeros are not shown. Numbers in parentheses following the genome names are exclusive to that genome. Node A, leading to the 2011-12 European outbreak strains,and nodes B and C, also leading to particularly pathogenic strains, are discussed in the text.