Graphic representation of the occurrence of genetic markers in E. coli strains isolated from different hosts. Large blank circles represent each genetic marker, chuA, yjaA and the DNA fragment TspE4.C2. Strains from different hosts are represented by different geometric shapes as described in the upper left. Strains from herbivorous animals are represented in pink and strains from omnivorous animals are in yellow. Edges between a strain and a genetic marker mean that the marker was detected for that strain. Each subgroup is highlighted by a dotted ellipse and labeled accordingly.