A large Multicounty Outbreak of Invasive Listeriosis by a Listeria monocytogenes ST394 Clone Linked to Smoked Rainbow Trout, 2020 to 2021

An article by Halbedel et al. published in Clinical Microbiology (10 April 2023) reports a large multinational listeriosis outbreak with 55 cases (including 3 fatalities) that affected Germany, Austria, Denmark, and Switzerland during 2020 and 2021. Routine and ad hoc investigations of food samples identified L. monocytogenes isolates from smoked rainbow trout filets from a Danish producer grouping with the Ny9 cluster. Patient interviews confirmed the consumption of rainbow trout as the most likely infection source. The report demonstrates that international food trade can cause multicounty outbreaks that necessitate cross-border outbreak collaboration. It also corroborates the relevance of ready-to-eat smoked fish products as causes of listeriosis. @ https://journals.asm.org/doi/10.1128/spectrum.03520-22


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