Inflammatory diarrhea due to enteroaggregative Escherichia coli: Evidence from clinical and mice model studies

Dhira Rani Saha, Sucharita Guin, Rajendran Krishnan, Dhrubajyoti Nag, Hemanta Koley, Sumio Shinoda, Thandavarayan Ramamurthy


9 被引用数 (Scopus)


Background: This study was conducted to determine the role of enteroaggregative Escherichia coli (EAEC) in inflammatory diarrhea among hospitalized patients in Kolkata. The inflammatory pathogenesis of EAEC was established in mice model and histopathological studies. Presence of fecal leucocytes (FLCs) can be suspected for EAEC infection solely or as a mixed with other enteric pathogens. Methods. Active surveillance was conducted for 2 years on 2 random days per week with every 5§ssup§th§esup§ patient admitted to the Infectious Diseases Hospital (IDH). Diarrheal samples were processed by conventional culture, microscopy, ELISA and molecular methods. Two EAEC isolated as sole pathogens were examined in mice after induced intestinal infection. The intestinal tissue samples were processed to analyze the histological changes. Results: Of the 2519 samples screened, fecal leucocytes, erythrocytes and occult blood were detected in 1629 samples. Most of the patients had acute watery diarrhea (75%) and vomiting (78%). Vibrio cholerae O1 was the main pathogen in patients of 5-10 years age group (33%). Shigellosis was more in children from 2-5 years of age (19%), whereas children <2 years appeared to be susceptible for infection caused by EAEC (16%). When tested for the pathogenicity, the EAEC strains colonized well and caused inflammatory infection in the gut mucosa of BALB/C mice. Conclusion: This hospital-based surveillance revealed prevalence of large number of inflammatory diarrhea. EAEC was the suspected pathogen and <2 years children appeared to be the most susceptible age group. BALB/C mice may be a suitable animal model to study the EAEC-mediated pathogenesis.

ジャーナルGut Pathogens
出版ステータスPublished - 12月 3 2013

ASJC Scopus subject areas

  • 寄生虫科
  • 微生物学
  • 消化器病学
  • ウイルス学
  • 感染症


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