Swiss authorities have revealed a Listeria outbreak sickened 20 and killed one person in 2022.
The Federal Office of Public Health (OFSP), Federal Food Safety and Veterinary Office (OSAV), and cantonal, or regional, authorities detected an outbreak of listeriosis in July 2022 and identified smoked trout as the source.
In early July, an unusually high number of Listeria monocytogenes cases were reported to OFSP. Whole genome sequencing (WGS) confirmed they were linked.
As part of an investigation carried out with OFSP, patients were interviewed and evidence pointed to smoked trout produced by one company.
Cantonal food authorities carried out an inspection of the firm in the canton of Thurgovie, also known as Thurgau, which found the bacteria in smoked trout and in the production environment. WGS matched the isolates from food samples and patients, confirming the link.
In July, smoked fish from the company Kundelfingerhof was withdrawn from sale and recalled from stores such as Coop, Migros, and Volg.