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Journal of Clinical Microbiology, December 2008, p. 4052-4055, Vol. 46, No. 12
0095-1137/08/$08.00+0     doi:10.1128/JCM.01252-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.

Escherichia coli O125ac:H6 Encompasses Atypical Enteropathogenic E. coli Strains That Display the Aggregative Adherence Pattern{triangledown} ,§

Samar F. Barros,1,{dagger} Cecilia M. Abe,1 Sérgio P. D. Rocha,1 Renato M. Ruiz,1 Lothar Beutin,2 Luiz R. Trabulsi,1,{ddagger} and Waldir P. Elias1*

Laboratório de Bacteriologia, Instituto Butantan, São Paulo, Brazil,1 Federal Institute for Risk Assessment, National Reference Laboratory for Escherichia coli, Berlin, Germany2

Received 2 July 2008/ Accepted 3 October 2008

O125 is an enteropathogenic Escherichia coli (EPEC) serogroup, which includes the O125ac:H6 serotype, defined as atypical EPEC. Strains of this serotype displayed the aggregative adherence (AA) pattern with HEp-2, Caco-2, T84, and HT-29 cells, possessed all the LEE region genes, and expressed intimin, Tir, and EspABD, although the attaching-effacing lesion was not detected in vitro. These results confirm that E. coli O125ac:H6 is atypical EPEC that displays the AA pattern and indicate the necessity of testing for EPEC genes combined with the determination of the adherence pattern for atypical EPEC identification.

* Corresponding author. Mailing address: Laboratório de Bacteriologia, Instituto Butantan, Avenida Vital Brazil 1500, 05503-900 São Paulo, SP, Brazil. Phone: 55 11 3726-7222, ext. 2075. Fax: 55 11 3726-1505. E-mail: wpelias{at}butantan.gov.br

{triangledown} Published ahead of print on 15 October 2008.

§ Supplemental material for this article may be found at http://jcm.asm.org/.

{dagger} Present address: Laboratório de Imunologia, Instituto do Coração, Faculdade de Medicina da Universidade de São Paulo, São Paulo, Brazil.

{ddagger} In memoriam.

Journal of Clinical Microbiology, December 2008, p. 4052-4055, Vol. 46, No. 12
0095-1137/08/$08.00+0     doi:10.1128/JCM.01252-08
Copyright © 2008, American Society for Microbiology. All Rights Reserved.





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