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Bacterial adherence on villi in pig ileal (A) and colon (B) loops inoculated with wild-type EHEC O157:H7 strain 86-24 grown in BHIN; the adherence is more extensive in the ileal loops than in the colon loops. Arrows point to clusters of bacteria. Villi in control ileal (C) and colon (D) loops, inoculated with the mutant strain 86-24ΔescN, show no adherence. Giemsa; ×200.
