Table 1.

Overview over E. coli strains used in the study

Strain	Source	Characteristics	Reference
E. coli wildtype strains
K46	Septicemia, lamb	O78 Tetracycline and sulfonamide resistant Phylogenetic group Ca	[12]
Ctr 1	Feces, healthy lamb	Phylogenetic group B2	[12]
Ctr 2	Feces, healthy lamb	Phylogenetic group B1	[12]
Ctr 3	Feces, healthy lamb	Phylogenetic group B2	[12]
Ctr 4	Feces, healthy lamb	Phylogenetic group B2	[12]
CFT073	Pyelonephritis, human	O6:K2:H1 Cytotoxic	[31], [2]
UTI89	Cystitis-derived, human	O18:K1:H7	[32]
E. coli recombinant strains
CFT073-ClmR	CFT073	Chloramphenicol resistant	[33]
K46 pGEN-GFP	K46	Expresses destabilized green fluorescent protein (GFP)	This study
Ctr 1 pGEN-GFP	Ctr 1	Expresses destabilized GFP	This study
Ctr 2 pGEN-GFP	Ctr 2	Expresses destabilized GFP	This study

^aPreviously referred to as belonging to phylogenetic group A, but is now regrouped to Group C [12].