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An improved enterocyte adhesion assay has been used to examine a collection of 44 strains of enterotoxigenic Escherichia coli (ETEC) for their ability to adhere to the brush border of isolated human duodenal enterocytes. Fourteen strains showed good adhesion; in each case the ability to adhere correlated with the production of colonization factor antigen I or II (CFA/I or CFA/II) fimbriae. CFA/II-positive producing coli surface antigens 1 and 3 (CS1 and CS3), coli surface antigens 2 and 3 (CS2 and CS3), and only coli surface antigen 3 (CS3) each showed good adhesion. CS3-mediated brush border attachment of CFA/II-positive ETEC was demonstrated by electron microscopy with monospecific antibody and an immunogold labeling technique. One CFA/I-positive ETEC strain was nonadherent in the assay, as were ETEC producing type 1 somatic fimbriae. Five animal ETEC strains producing K88, K99, F41, and 987P fimbriae were slightly more adhesive than control strains, but adhesion was significantly less than that of CFA-positive ETEC. Twenty five human ETEC strains that lacked CFA/I and CFA/II were nonadherent, suggesting either that the surface antigens responsible for adhesion to human intestinal mucosa in these strains were not being produced or that mucosal receptors for these strains are present in regions of the small intestine other than the duodenum.

Adhesion of enterotoxigenic Escherichia coli to human small intestinal enterocytes