Table 1 The pathogenic potential of the three main different groups of E. coli strains3,4.

From: The risk of urinary tract infection in vegetarians and non-vegetarians: a prospective study

Clinical manifestationGroups of E. coli
CommensalExPECaIntestinal pathogenic
Asymptomatic intestinal colonizationMajorMinorNone
Uncomplicated UTIsMinorMajorNone
Complicated UTIs50%50%None
Other infections other than UTI and gastroenteritisVariableVariableNone
  1. aExPEC: extra-intestinal pathogenic E. coli.