Extended-Spectrum β-Lactamase–Producing Escherichia coli From Retail Chicken Meat and Humans: Comparison of Strains, Plasmids, Resistance Genes, and Virulence Factors

Kluytmans, Jan A. J. W.; Overdevest, Ilse T. M. A.; Willemsen, Ina; Kluytmans-van den Bergh, Marjolein F. Q.; van der Zwaluw, Kim; Heck, Max; Rijnsburger, Martine; Vandenbroucke-Grauls, Christina M. J. E.; Savelkoul, Paul H. M.; Johnston, Brian D.; Gordon, David; Johnson, James R.
February 2013
Clinical Infectious Diseases;Feb2013, Vol. 56 Issue 4, p478
Academic Journal
We compared the genetic composition of extended-spectrum β-lactamase–producing Escherichia coli from chicken meat, human carriers, and blood cultures in the Netherlands. The substantial overlap found among the 3 groups indicates that chicken meat is a source for resistant E. coli in humans.Background. The worldwide prevalence of extended-spectrum β-lactamase (ESBL)–producing Enterobacteriaceae is increasing rapidly both in hospitals and in the community. A connection between ESBL-producing bacteria in food animals, retail meat, and humans has been suggested. We previously reported on the genetic composition of a collection of ESBL-producing Escherichia coli (ESBL-EC) from chicken meat and humans from a restricted geographic area. Now, we have extended the analysis with plasmid replicons, virulence factors, and highly discriminatory genomic profiling methods.Methods. One hundred forty-five ESBL-EC isolates from retail chicken meat, human rectal carriers, and blood cultures were analyzed using multilocus sequence typing, phylotyping, ESBL genes, plasmid replicons, virulence genes, amplified fragment length polymorphism (AFLP), and pulsed-field gel electrophoresis (PFGE).Results. Three source groups overlapped substantially when their genetic composition was compared. A combined analysis using all variables yielded the highest resolution (Wilks lambda [Λ]: 0.08). Still, a prediction model based on the combined data classified 40% of the human isolates as chicken meat isolates. AFLP and PFGE showed that the isolates from humans and chicken meat could not be segregated and identified 1 perfect match between humans and chicken meat.Conclusions. We found significant genetic similarities among ESBL-EC isolates from chicken meat and humans according to mobile resistance elements, virulence genes, and genomic backbone. Therefore, chicken meat is a likely contributor to the recent emergence of ESBL-EC in human infections in the study region. This raises serious food safety questions regarding the abundant presence of ESBL-EC in chicken meat.


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