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Objectives:  The aim of this study was to characterize a collection of 520  Salmonella enterica  serovar Infantis strains isolated from food (poultry meat), human infections and environmental sources from the years 2010, 2013 and 2015 in Switzerland.   Methods:  We performed antimicrobial susceptibility testing and pulsed-field gel electrophoresis (PFGE) analysis on all 520  S . Infantis isolates, and whole genome sequencing (WGS) on 32 selected isolates.   Results:  The majority (74.8%) of the isolates was multidrug resistant (MDR). PFGE analysis revealed that 270 (51.9%) isolates shared an identity of 90%. All isolates subjected to WGS belonged to sequence type (ST) 32 or a double-locus variant thereof (one isolate). Seven (21.9%) of the sequenced isolates were phylogenetically related to the broiler-associated clone B that emerged in Hungary and subsequently spread within and outside of Europe. In addition, three isolates harboring  bla  CTX-M-65  on a predicted large (∼320 kb) plasmid grouped in a distinct cluster.   Conclusion:  This study documents the presence of the Hungarian clone B and related clones in food and human isolates between 2010 and 2015, and the emergence of a  bla  CTX-M-65  harboring MDR  S . serovar Infantis lineage.

frontiers in microbiology

Salmonella enterica serovar Infantis from Food and Human Infections, Switzerland, 2010–2015: Poultry-Related Multidrug Resistant Clones and an Emerging ESBL Producing Clonal Lineage