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Adherence and invasiveness of the EHEC strain EDL933ΔespD. The ability of EHEC strains EDL933 and EDL933ΔespD to attach to and invade HeLa cells was determined as described in Materials and Methods. As a control, the attachment and invasion of E. coli K-12 were also analyzed (0.1 and 0%, respectively, of the values for EDL933 [not shown]). Differences between EDL933 and EDL933ΔespD were statistically significant at a P of ≤0.05 (∗).
