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To clarify the pathogenic role of enteropathogenic Escherichia coli (EPEC) or enteroaggregative E. coli (EAggEC), the possession of eaeA gene of EPEC or aggR gene of EAggEC in the strains isolated from 525 patients in sporadic diarrhea cases during 3 years (1998-2000) in Tama, Tokyo was investigated by a PCR method. The eaeA-positive E. coli strains were confirmed from 23 cases including 5 cases detected verotoxin-producing E. coli (VTEC), and those except VTEC strains (18 cases, 3.4%) were the 5th predominant enteropathogen following rotavirus, Campylobacter, adenovirus, and Salmonella. By age, 17 eaeA-positive cases were from children &lt; 10 years of age, and noticeably, of which 9 were from infants &lt; 24 months of age. On the other hand, although aggR-positive E. coli strains were detected from 11 cases (2.1%), of which 6 also were from infants &lt; 24 months of age. Clinical symptoms of patients whom eaeA or aggR gene-positive E.coli was isolated as the only potential enteric pathogen were similar, showing a mild gastroenteritic features. Only one strain of eaeA-positive E. coli and 4 of aggR-strains were typed with the commercial O-antisera, which were O55, and O86, O111 or O126. In antibiotic sensitivity tests for 9 agents, 22% of eaeA-strains and 91% of aggR-strains showed resistant, especially 10 aggR-strains had resistant to ABPC. These findings suggest that these organisms are a significant causative agents of infantile diarrhea and the PCR method is a useful procedure for the diagnosis of EPEC or EAggEC infectious disease.

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The Incidence and the Valuation of eaeA Gene of Enteropathogenic Escherichia coli (EPEC) or aggR Gene of Enteroaggregative E. coli (EAggEC) in the Strains Isolated from Patients in Sporadic Diarrhea Cases