Abstract
Escherichia coli coli (EAEC) are identified by their ability to produce the aggregative adherence (AA) pattern to cultured epithelial cells. EAEC prototype strains adhere to HEp-2 cells and to intestinal mucosa by virtue of AAF (aggregative adherence fimbriae), which are encoded on pAA plasmids; all AAF biogenesis genes are controlled by the regulator called AggR. However, atypical EAEC s…