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Virulence factors of Escherichia coli strains belonging to serogroups O127 and O142

Published online by Cambridge University Press:  07 October 2003

A. C. R. GHILARDI ,
T. A. T. GOMES ,
W. P. ELIAS  and
L. R. TRABULSI
A. C. R. GHILARDI
Affiliation:
Seção de Bacteriologia, Instituto Adolfo Lutz, São Paulo, Brazil
T. A. T. GOMES
Affiliation:
Departamento de Microbiologia, Imunologia e Parasitologia, Universidade Federal de São Paulo, Escola Paulista de Medicina, São Paulo, Brazil
W. P. ELIAS
Affiliation:
Laboratório Especial de Microbiologia, Instituto Butantan, São Paulo, Brazil
L. R. TRABULSI
Affiliation:
Laboratório Especial de Microbiologia, Instituto Butantan, São Paulo, Brazil
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Abstract

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A total of 102 Escherichia coli strains belonging to serogroups O127 and O142 were examined for genotypic and phenotypic characteristics. The most frequent serotypes found were O127[ratio ]H21, O127[ratio ]H40 and O142[ratio ]H34. The virulence properties were evaluated by adhesion to HeLa cells and hybridization with gene probes for diarrhoeagenic E. coli. Most strains in the two serogroups were categorized as enteropathogenic E. coli, but enteroaggregative E. coli was also detected in both serogroups. All strains that carried the eae sequence presented the LEE region inserted in selC. Five ribotypes were detected in serogroup O127 and four in serogroup O142 and a correlation between serotypes and ribotypes was observed mainly in serogroup O142.

Type
Research Article
Information
Epidemiology & Infection , Volume 131 , Issue 2 , October 2003 , pp. 815 - 821
Copyright
2003 Cambridge University Press