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Journal of Clinical Microbiology, February 2001, p. 782-786, Vol. 39, No. 2
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.2.782-786.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.

Identification of a Cluster of Strains Bearing a New Adhesin among Genetically Diverse Enterotoxigenic Escherichia coli Isolates of Serogroup O20

Mariana Pichel,1 Norma Binsztein,1 Gabriel Gutkind,2 and Gloria Viboud1,*

Departamento de Bacteriología, Instituto Nacional de Enfermedades Infecciosas---ANLIS "Carlos G. Malbrán",1 and Cátedra de Microbiología, Facultad de Farmacia y Bioquímica, Universidad de Buenos Aires,2 Buenos Aires, Argentina

Received 28 July 2000/Returned for modification 22 October 2000/Accepted 18 November 2000

About one-third of the enterotoxigenic Escherichia coli isolates lack any of the known colonization factors. Among this group, those of serogroup O20 are the most frequently isolated in Argentina. By combining analysis of adhesion to Caco-2 cells, random amplified polymorphic DNA, and pulsed-field gel electrophoresis techniques, we were able to identify three sets of closely related strains with different binding properties. Further analysis of the most prevalent group revealed that all these isolates expressed the recently described adhesin CS22.

* Corresponding author. Mailing address: Dept. of Molecular Genetics and Microbiology, School of Medicine, State University of New York at Stony Brook, Stony Brook, NY 11794-5222. Phone: (631) 632-8783. Fax: (631) 632-9797. E-mail: gviboud{at}ms.cc.sunysb.edu.

Journal of Clinical Microbiology, February 2001, p. 782-786, Vol. 39, No. 2
0095-1137/01/$04.00+0   DOI: 10.1128/JCM.39.2.782-786.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.


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