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The adherent site of "attaching and effacing Escherichia coli" (AEEC; O103: H-, SK-1 strain) on the intestinal epithelial cells of chicks infected naturally and experimentally was ultrastructurally investigated. The eaeA gene was detected by polymerase chain reaction in the SK-1 strain of E. coli isolated from the intestinal content of a chick infected naturally, however, the bundle-forming pilus (bfp) gene could not be detected. The SK-1 strain (bfp-) of AEEC could attach to the intestinal epithelial cell and induce attaching-effacing lesions in the intestine of chicks. Transmission electron microscopy revealed numerous pilus-like microfilaments in the space between colibacilli and the membranes of the intestinal epithelial cells. The present study suggests that SK-1 strain (eaeA+, bfp-) may attach closely to the intestinal epithelial cells by a novel adhesion different from bfp.

A New Adherent Form of an Attaching and Effacing Escherichia coli (eaeA+, bfp-) to the Intestinal Epithelial Cells of Chicks.