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  • 1 Hamadan University of Medical Sciences Department of Microbiology, Faculty of Medicine Hamadan Iran
  • | 2 Hamadan University of Medical Sciences Department of Paediatrics, Faculty of Medicine Hamadan Iran
  • | 3 Hamadan University of Medical Sciences Department of Immunology, Faculty of Medicine Hamadan Iran
  • | 4 Pasteur Institute of Iran Department of Microbiology Tehran Iran
  • | 5 Hamadan University of Medical Sciences Hamadan Iran
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Diarrhoeagenic Escherichia coli (DEC) represents a main group of enteric pathogens that cause human diarrhoea. Because it is not simply distinguished from normal flora by simple laboratory methods, modern molecular diagnostic assays are necessary. Although it is neither necessary nor applicable to perform PCR for all patients, it is of many advantages to verify the prevalence of DEC in different areas by this method. Knowing the prevalence of DEC in an area, we can focus on few pathogens and narrow our antimicrobial treatment. The aim of this study is to evaluate the contribution of the different DEC categories in children diarrhoea in the west of Iran.The stool specimens of 251 children with diarrhoea were collected from June to September 2007. Polymerase chain reaction (PCR) was performed to determine the presence of enteropathogenic (EPEC), enterotoxigenic (ETEC), entero-invasive (EIEC), Shiga toxin-producing (STEC) and entero-aggregative (EAEC) strains. ETEC strains were isolated from 13 and EAEC strains from 16 children. STEC was detected in 7 children, and no EIEC was isolated. Finally, EPEC strains were isolated in 41 cases. EAEC and EPEC are the most frequent DECs in children less than 10 years of age in West of Iran.

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