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ExPEC-typical virulence-associated genes correlate with successful colonization by intestinal E. coli in a small piglet group |
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| Authors: | Schierack Peter Walk Nicole Ewers Christa Wilking Hendrik Steinrück Hartmut Filter Matthias Wieler Lothar H |
| Institution: | Institut für Mikrobiologie und Tierseuchen, Fachbereich Veterinärmedizin, Freie Universität Berlin, Germany (here the work was conducted).; Institut für Epidemiologie, Friedrich Loeffler Institut (FLI), Wusterhausen, Germany.; Nationales Referenzlabor für E. coli, Bundesinstitut für Risikobewertung (BfR), Berlin, Germany.; Institut für Molekularbiologie und Bioinformatik, Charité, Humboldt-Universität Berlin, Germany.; Fachbereich Bio-, Chemie- und Verfahrenstechnik, Fachhochschule Lausitz, Senftenberg, Germany. |
| Abstract: | Upon studying the transmission of Escherichia coli from a sow to five of her piglets, we observed domination of the coliform flora in piglets by a single E. coli clone, especially after weaning. This haemolytic cloneH1 did not harbour any virulence determinants typical for intestinal pathogenic E. coli isolates from swine but had a virulence gene profile very similar to extraintestinal E. coli (ExPEC), including genes coding for P fimbriae and several iron acquisition systems, besides having an affiliation to the phylogenetic B2 group. Overall, we show that the presence of higher numbers of ExPEC-typical virulence-associated genes (VAGs) in clones correlate with their successful colonization ability in piglets. We conclude that VAGs typical for ExPEC also support intestinal colonization in healthy pigs. Faeces of healthy domestic pigs can harbour high numbers of ExPEC-similar E. coli and are suggested to be a potential risk for the transmission of such bacteria to other hosts. |
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