The presence of the enteroaggregative Escherichia coli (EAEC) virulence genes aatA, aap, and aggR was assayed in strains of different diarrheagenic E. coli pathotypes and nonpathogenic E. coli. The dispersin-encoding gene (aap) was detected in EAEC, diffusely adherent E. coli, and nonpathogenic E. coli, demonstrating that molecular diagnostics of EAEC based on aap detection may identify non-EAEC strains.
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