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Using multiplex real-time PCR, 960 fecal samples collected from poultry, cattle, and patients with diarrhea in Bangladesh were screened for diarrheagenic Escherichia coli (DEC). The invasion-related gene virB showed the highest prevalence in human patients (41%) and was shown to be positively correlated first with afaB with regards to diffuse adhesion and second with aggR with regards to aggregative adhesion. These three genes were specific to human patients. In contrast, the Shiga toxin genes stx1 (57%) and stx2 (40%) were prevalent in cattle samples. The eae gene, which is associated with attaching and effacing lesion formation, and the elt and est genes, which are associated with enterotoxins, were detected from all three sample sources. Heat map construction and hierarchical clustering assigned the samples into five different clusters, with the patient samples positive for virB and afaB being placed together in one cluster. Although the detection of virulence genes cannot be a direct indication of the distribution of diarrheagenic organisms, their detection suggests that Shigella spp. or enteroinvasive E. coli are the most prevalent diarrheagenic bacteria in Bangladesh and that diffusely adherent E. coli is concomitantly present with these bacteria. eae-possessing organisms in patients may come from cattle and poultry sources. The small number of stx-positive patients could be explained by the small number of animal samples that were positive for both eae and stx.

japanese journal of infectious diseases

Prevalence of Virulence Genes of Diarrheagenic &lt;i&gt;Escherichia coli&lt;/i&gt; in Fecal Samples Obtained from Cattle, Poultry and Diarrheic Patients in Bangladesh