Figure 1.

Maximum likelihood phylogeny shown as cladogram. The cladogram shows the 117 porcine commensal E. coli genomes from the present study as well as 68 from the second farm described in our previous study (labelled “F2”). Label highlight colour indicates phylogroups. Sequence types are represented by a coloured strip. Class 1 integron structures in Figure 3 are annotated with letters (a- l). “o” (black square) indicates that another integron not shown in Figure 3 was identified. “u” (white square) indicates that the integron structure was not determined.