Fig. 2

The distribution of virulence categories across the eight phylogroups of E. coli. Based on the total number of virulence factors (VFs) present in the genome, we categorized the genome into four virulence categories, i.e., (1) likely nonpathogenic (#VFs <6); (2) likely virulent (6 ≤ #VFs <14); (3) highly virulent (14 ≤ #VFs < 22), and (4) extremely virulent (#VFs ≥ 22)