TABLE 1.

Archetypal E. coli control strains used in this study

E. coli straina	Gene(s) or classification method	Host origin	Source or reference
28C	hly, cnf1, cdt-IV, clbA,bclbK,bclbJ,bclbQb	Porcine septicemia	13
1404	cnf2, cdt-III	Bovine septicemia	47
IHE3034 ΔclbP	cdt-I, clb ΔclbP	Newborn meningitis	41
DH5α(pCP2123)	cdt-II	Laboratory strain	54
C48a	cnf3, eae, cifb	Healthy lamb	45
DH10β(pBACpks)	clb	Laboratory strain	41
E22	cif, eae	Rabbit, EPEC	38
RS218	PCR-based phylotyping	Newborn meningitis	61
EDL933	eae, stx1, stx2	EHEC	51
DH5α		Laboratory strain	Novagen

^aStrain C48a was kindly provided by José Antonio Orden, and strain RS218 was kindly provided by Philippe Bidet and Edouard Bingen.

^bThe clbA, clbK, clbJ, clbQ, and cif genes were detected during this study.