title: Distribution of additional virulence factors related to adhesion and toxicity in Shiga toxin-producing Escherichia coli isolated from raw products in Argentina.
abstract: A total of 73 Shiga toxin-producing Escherichia coli (STEC) isolates, belonging to 25 serotypes and isolated from raw products in Argentina, were examined for the occurrence of genes responsible for bacterial adhesions to intestine, ehaA (EHEC autotransporter), lpfAO113 (long polar fimbriae), sab (STEC autotransporter [AT] contributing to biofilm formation), ecpA (E. coli common pilus), hcpA (haemorrhagic coli pilus), elfA (E. coli laminin-binding fimbriae), sfpA (sorbitol-fermenting EHEC O157 fimbriae plasmid-encoded) and of the toxigenic gene cdt-V (cytolethal distending toxin). Our study showed different adhesin profiles that are not linked to one specific serotype and that all analysed isolates possess, besides stx genes, some adherence genes. Several of the isolates contained also multiple toxin genes. The results of the present work alert the presence of genes coding for additional adhesins and cdt-V toxin in LEE-negative STEC strains that occur in foods, and this traits could increase their pathogenic potential.
  
  
  CONCLUSIONS
  Meat products are one of the main vehicles of Shiga toxin-producing E. coli, and the presence of genes coding for additional adhesins and toxins could increase their pathogenic potential. There is a need for a more detailed characterization of the strains in regard to these extra virulence factors.
authors.affiliation: Laboratorio de Inmunoquímica y Biotecnología, CIVETAN-Facultad de Ciencias Veterinarias, Universidad Nacional del Centro de la Pcia. de Buenos Aires, Tandil, Argentina.
authors.forename: J S
authors.initials: JS
authors.lastname: Cadona
authors.forename: A V
authors.initials: AV
authors.lastname: Bustamante
authors.forename: A E
authors.initials: AE
authors.lastname: Parma
authors.forename: P M A
authors.initials: PM
authors.lastname: Lucchesi
authors.forename: A M
authors.initials: AM
authors.lastname: Sanso
mesh_terms: D018829:Adhesins, Bacterial / Q000235:genetics; D001118:Argentina; D001427:Bacterial Toxins / Q000235:genetics; D004926:Escherichia coli / Q000235:genetics / Q000302:isolation & purification / Q000472:pathogenicity; D029968:Escherichia coli Proteins / Q000235:genetics; D005798:Genes, Bacterial; D008461:Meat Products / Q000382:microbiology*; D022603:Shiga Toxins / Q000235:genetics; D054323:Shiga-Toxigenic Escherichia coli / Q000145:classification / Q000235:genetics / Q000302:isolation & purification* / Q000472:pathogenicity*; D037521:Virulence Factors / Q000235:genetics*
chemical_list: D018829:Adhesins, Bacterial; D001427:Bacterial Toxins; D029968:Escherichia coli Proteins; D022603:Shiga Toxins; D037521:Virulence Factors; C067044:cytolethal distending toxin