The ecology of Escherichia coli - Escherichia coli: Pathotypes and Principles of Pathogenesis - page 2

FIGURE 1.1 This phylogeny presented depicts our current understanding of the diversity
to be found in the genus Escherichia and the phylo-group structure observed with the species
E. coli . The phylogeny also demonstrates that both major types of E. coli pathogens, those causing
diarrheal disease (EPEC, ETEC, STEC, EAEC, and Shigella ; in red) and extraintestinal infec-
tion (ExPEC; in blue) are present in multiple phylogenic lineages. Strain names are presented as
well as ST numbers (MLST hosted at http://mlst.ucc.ie/mlst/dbs/Ecoli ) when available and the
pathovar designation for the strain. Strains in black were isolated from the feces of asymptomatic
hosts.
E. fergusonii has been implicated as an opportunistic extraintestinal patho-
gen of humans ( Farmer et al., 1985 ; Funke et al., 1993 ; Savini et al., 2008 ),
birds, and mammals ( Herráez et al., 2005 ; Hariharan et al., 2007 ). It has
been suggested that E. fergusonii is also capable of causing intestinal disease