Researchers have shared details about how a Listeria outbreak in Switzerland in 2022 traced to fish was solved.

In the summer of 2022, the Federal Office of Public Health (OFSP) noticed increased reports of listeriosis cases, indicating a possible outbreak.

Twenty Listeria monocytogenes patient isolates were found to belong to an outbreak cluster, and 18 cases occurred in northeastern Switzerland. The median age of patients was 77.4 years old, with a range of 58 to 89 years old, and both sexes were equally affected. Nineteen people were hospitalized, and one person died.

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