Table 1.

E. coli strains used in this study.

Name	Description	Source or references
EDL933	Wild-type EHEC O157:H7	Riley et al., 1983
EDL933 ΔescN	EDL933 escN deletion mutant	Jarvis and Kaper, 1996
EDL933 ΔfliC	EDL933 fliC deletion mutant	Gobert et al., 2008
EDL933 Δstx	EDL933 stx1 stx2 deletion mutant	Gobert et al., 2007
85–170	Stx-negative EHEC O157:H7	Tzipori et al., 1987
85–170 ΔhcpA	85–170 hcpA deletion mutant	Xicohtencatl-Cortes et al., 2007
85–170 ΔlpfA1	85–170 lpfA1 deletion mutant	Fitzhenry et al., 2006
Walla-1	EHEC O157:H7	Ostroff et al., 1990
H0-7184-0336	EHEC O157:H7	G. Smith, Public Health England