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J Med Microbiol 55 (2006), 545-549; DOI: 10.1099/jmm.0.46343-0
© 2006 Society for General Microbiology
ISSN 1473-5644

Intraserotype diversity among Argentinian verocytotoxigenic Escherichia coli detected by random amplified polymorphic DNA analysis

Alejandra Krüger, Nora L. Padola, Alberto E. Parma and Paula M. A. Lucchesi

Lab. Inmunoquímica y Biotecnología, Depto. Sanidad Animal y Medicina Preventiva, Fac. Cs. Veterinarias, Universidad Nacional del Centro Pcia. Buenos Aires, Pinto 399 (7000), Tandil, Argentina

Correspondence
Paula M. A. Lucchesi
paulaluc{at}vet.unicen.edu.ar

Received 22 September 2005
Accepted 12 January 2006

Most cases of diarrhoea-associated haemolytic uraemic syndrome (HUS) are caused by verocytotoxin-producing Escherichia coli (VTEC). Argentina has the highest worldwide incidence of HUS, but with a lower incidence of VTEC O157 : H7 serotype than non-Latin American countries. A large number of VTEC serotypes have been isolated from cattle and cattle-derived food products in Argentina. The aim of this work was to study intraserotype genetic diversity among these VTEC strains by random amplification of polymorphic DNA (RAPD). Strains were selected that belonged to the same serotype, but had been isolated from different sources (cattle and meat). Intraserotype genetic diversity was detected among strains belonging to O20 : H19, O113 : H21, O117 : H7, O157 : H7, O171 : H2 and O174 : H21, but only one RAPD profile corresponded to strains belonging to O91 : H21, although these isolates were from different sources.

Abbreviations: RAPD, random amplification of polymorphic DNA; VTEC, verocytotoxin-producing Escherichia coli.






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