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The adhesin involved in diffuse adherence (AIDA‐I) is an autotransporter found in pathogenic strains of Escherichia coli causing diarrhea in humans and pigs. The AIDA‐I protein is glycosylated by a specific enzyme, the AIDA‐associated heptosyltransferase (Aah). The aah gene is immediately upstream of the aidA gene, suggesting that they form an operon. However, the mechanisms of regulation of the aah...