Diarrheagenic Escherichia coli in Children from Costa Rica

Cristian Pérez Laboratorio Clínico Hospital Nacional de Niños Dr. Carlos Sáenz Herrera, San José, Costa Rica; Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Iowa, Iowa City, Iowa; Centro de Investigación en Estudios Tropicales, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica

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Oscar G. Gómez-Duarte Laboratorio Clínico Hospital Nacional de Niños Dr. Carlos Sáenz Herrera, San José, Costa Rica; Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Iowa, Iowa City, Iowa; Centro de Investigación en Estudios Tropicales, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica

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María L. Arias Laboratorio Clínico Hospital Nacional de Niños Dr. Carlos Sáenz Herrera, San José, Costa Rica; Division of Pediatric Infectious Diseases, Department of Pediatrics, University of Iowa, Iowa City, Iowa; Centro de Investigación en Estudios Tropicales, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica

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More than 5,000 diarrheal cases per year receive medical care at the National Children's Hospital of Costa Rica, and nearly 5% of them require hospitalization. A total of 173 Escherichia coli strains isolated from children with diarrhea were characterized at the molecular, serologic, and phenotypic level. Multiplex and duplex polymerase chain reactions were used to detect the six categories of diarrheagenic E. coli. Thirty percent (n = 52) of the strains were positive, indicating a high prevalence among the pediatric population. Enteropathogenic E. coli and enteroinvasive E. coli pathotypes were the most prevalent (21% and 19%, respectively). Pathogenic strains were distributed among the four E. coli phylogenetic groups A, B1, B2, and D, with groups A and B1 the most commonly found. This study used molecular typing to evaluate the prevalence of diarrheagenic E. coli reported in Costa Rica and demonstrated the importance of these pathotypes in the pediatric population.

Author Notes

*Address correspondence to Cristian Pérez, División de Biología Molecular, Laboratorio Clínico, Hospital Nacional de Niños, PO Box 1654-1000, San José, Costa Rica, E-mail: cperezc@hnn.sa.cr, or Oscar G. Gómez-Duarte, Division of Infectious Diseases, Department of Pediatrics, University of Iowa, 200 Hawkins Drive, Iowa City, IA 52242, E-mail: oscar-gomez@uiowa.edu.

Financial support: This study was in supported in part by a National Institutes of Health K12 mentored research award and by Children's Miracle Network-University of Iowa, Iowa City, IA, grant 1892-2007 to Oscar G. Gómez-Duarte.

Authors' addresses: Cristian Pérez, División de Biología Molecular, Laboratorio Clínico, Hospital Nacional de Niños, San José, Costa Rica, E-mail: cperezc@hnn.sa.cr. Oscar G. Gómez-Duarte, Division of Pediatric Infectious Diseases, University of Iowa Children's Hospital, Iowa City, IA, E-mail: oscar-gomez@uiowa.edu. María L. Arias, Departamento de Microbiología de Aguas y Alimentos, Facultad de Microbiología, Universidad de Costa Rica, San José, Costa Rica, E-mail: mariasechandi@ucr.ac.cr.

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