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Journal of Clinical Microbiology, January 2009, p. 93-98, Vol. 47, No. 1
0095-1137/09/$08.00+0 doi:10.1128/JCM.01166-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.
Association of Diarrheagenic Escherichia coli Pathotypes with Infection and Diarrhea among Mexican Children and Association of Atypical Enteropathogenic E. coli with Acute Diarrhea 
Teresa Estrada-Garcia,1*
Catalina Lopez-Saucedo,1
Rocio Thompson-Bonilla,1,2
Maricela Abonce,1
Daniel Lopez-Hernandez,1
Jose Ignacio Santos,3
Jorge L. Rosado,4
Herbert L. DuPont,5 and
Kurt Z. Long6
Department of Molecular Biomedicine, CINVESTAV-IPN, Mexico City, Mexico,1 Department of Immunology, ENCB-IPN, Mexico City, Mexico,2 Hospital Infantil de Mexico Federico Gomez, Mexico City, Mexico,3 Universidad Autonoma de Querétaro, Queretaro, Mexico,4 Houston School of Public Health, University of Texas—Houston, St. Luke's Episcopal Hospital, and Baylor College of Medicine, Houston, Texas,5 Nutrition, Disease and Injury Control Unit, School of Population Health, University of Queensland, Herston, Queensland, Australia6
Received 19 June 2008/ Returned for modification 3 August 2008/ Accepted 6 November 2008
Seventy-six children 
2 years old were prospectively followed for 1 year in a peri-urban community of Mexico City to determine asymptomatic infection and acute diarrhea associated with diarrheagenic Escherichia coli pathotypes (DEPs). By use of a pathogen-specific multiplex PCR, DEPs were sought in 795 stool samples, of which 125 (16%) were positive for DEP; of these, 4 represented shedding episodes and 4 parasite coinfections. Most single-DEP infections (85/117) were asymptomatic (P < 0.001), and of the 32 DEP diarrhea episodes, 41% were associated with atypical enteropathogenic E. coli (aEPEC), 37.5% with enterotoxigenic E. coli, 9% with typical EPEC, 9% with enteroinvasive E. coli, and 3% with Shiga toxin-producing E. coli strains. Among the 76 children, 54 had at least one stool positive for DEP, of which 23 experienced a DEP-associated diarrhea episode. In the last group of children, DEP infection was significantly associated with a diarrhea episode (relative risk [RR] = 2.5; 95% confidence interval [CI], 1.79 to 3.57; P < 0.001), with ETEC (RR = 2.30; 95% CI, 1.49 to 3.54; P = 0.003) and aEPEC (RR = 1.92; 95% CI, 1.23 to 3.0; P = 0.019) being the pathotypes associated with diarrhea. aEPEC-associated diarrhea episodes were frequently in the <12-month age group (RR = 2.57; 95% CI, 1.05 to 6.27; P = 0.04). aEPEC infections were distributed all year round, but associated diarrheal episodes were identified from April to October, with a May-June peak (rainy season). Most ETEC infections and diarrhea episodes characteristically occurred during the summer (rainy season), with a diarrhea peak in August. Of all DEPs, only aEPEC was associated with acute diarrhea episodes lasting 7 to 12 days (P = 0.019). DEPs are important causes of community-acquired enteric infection and diarrhea in Mexican children.
* Corresponding author. Mailing address: Department of Molecular Biomedicine, CINVESTAV-IPN, Av. IPN No. 2508, Col. Zacatenco, C.P. 07360, Mexico City, Mexico. Phone: (5255) 5747 3327. Fax: (5255) 5747 3938. E-mail: testrada{at}cinvestav.mx
Published ahead of print on 19 November 2008.
Journal of Clinical Microbiology, January 2009, p. 93-98, Vol. 47, No. 1
0095-1137/09/$08.00+0 doi:10.1128/JCM.01166-08
Copyright © 2009, American Society for Microbiology. All Rights Reserved.
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