2024-03-29T13:34:11Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/1418272022-11-22T13:53:00Zcom_10261_108com_10261_8col_10261_361
Detection of virulence-associated genes characteristic of intestinal Escherichia coli pathotypes, including the enterohemorrhagic/enteroaggregative O104: H4, in bovines from Germany and Spain
Cabal, Adriana
Cantón, Rafael
Gortázar, Christian
Domínguez, Lucas
Álvarez, Julio
European Commission
Universidad de Castilla La Mancha
Empresa Nacional de Residuos Radiactivos (España)
Pathotypes
O104:H4
Virulence-associated genes
Escherichia coli
Cattle are reservoirs of enterohemorrhagic Escherichia coli; however, their role in the epidemiology of other pathogenic E. coli remains undefined. A new set of quantitative real-time PCR assays for the direct detection and quantification of nine virulence-associated genes (VAGs) characteristic of the most important human E. coli pathotypes and four serotype-related genes (wzxO104, fliCH4, rbfO157, fliCH7) that can be used as a surveillance tool for detection of pathogenic strains was developed. A total of 970 cattle fecal samples were collected in slaughterhouses in Germany and Spain, pooled into 134 samples and analyzed with this tool. stx1, eae and invA were more prevalent in Spanish samples whereas bfpA, stx2, ehxA, elt, est and the rbfO157/fliCH7 combination were observed in similar proportions in both countries. Genes characteristic of the hybrid O104:H4 strain of the 2011 German outbreak (stx2/aggR/wzxO104/fliCH4) were simultaneously detected in six fecal pools from one German abattoir located near the outbreak epicenter. Although no isolate harboring the full stx2/aggR/wzxO104/fliCH4 combination was cultured, sequencing of the aggR positive PCR products revealed 100% homology to the aggR from the outbreak strain. Concomitant detection by this direct approach of VAGs from a novel human pathogenic E. coli strain in cattle samples implies that the E. coli gene pool in these animals can be implicated in de novo formation of such highly-virulent strains. The application of this set of qPCRs in surveillance studies could be an efficient early-warning tool for the emergence of zoonotic E. coli in livestock.
2016-12-22T13:57:10Z
2016-12-22T13:57:10Z
2015
2016-12-22T13:57:10Z
artículo
Microbiology and Immunology 59(8): 433-442 (2015)
http://hdl.handle.net/10261/141827
10.1111/1348-0421.12275
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100007480
eng
Sí
info:eu-repo/grantAgreement/EC/FP7/278976
closedAccess
John Wiley & Sons