Cross-border outbreak of listeriosis caused by cold-smoked salmon, revealed by integrated surveillance and whole genome sequencing (WGS), Denmark and France, 2015 to 2017

Susanne Schjorring, Sofie Gillesberg Lassen, Tenna Jensen, Alexandra Moura, Jette Sejer Kjeldgaard, Luise Mueller, Stine Thielke, Alexandre Leclercq, Mylene M. Maury, Mathieu Tourdjman, Marie-Pierre Donguy, Marc Lecuit, Steen Ethelberg, Eva M. Nielsen

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Abstract

In August 2017, an outbreak of six listeriosis cases in Denmark was traced to cold-smoked salmon, using epidemiological investigations and whole-genome sequencing (WGS) analyses. Exchange of genome sequences allowed identification in France of a food isolate from a salmon-derived product and a human isolate from 2016 within the same cgMLST cluster as the Danish isolates (L2-SL8-ST8-CT771). The salmon product came from a third European Union country. WGS can rapidly link human cases and food isolates across Europe.
Original languageEnglish
JournalEurosurveillance
Volume22
Issue number50
Pages (from-to)8-12
Number of pages5
ISSN1025-496X
DOIs
Publication statusPublished - 2017

Keywords

  • Cross-border outbreak
  • WGS
  • cold-smoked salmon
  • food-borne infections
  • listeriosis
  • surveillance
  • whole genome sequencing

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