Fig. 1

Whole genome phylogenetic tree of 127 E. coli isolates. Phylogenetic relationships of E. coli isolates based on core SNPs from whole genome sequencing. Isolates cultured from sheep and swine are represented in the inner ring in blue and yellow, respectively. The detailed host origin of each strain is described in red characters near the inner ring. The middle ring indicates groups of multilocus sequence typing (MLST) sequence types. Strains with the same ST types are denoted using the same color. Details regarding the ST type of each strain are described in blue near the middle ring. The outermost ring indicates O antigen groups. Strains with the same O serotypes are denoted using the same color. The detailed O serotype of every strain is described in green characters beside the outermost ring