A multi-year Listeria outbreak in Switzerland that killed 10 people was linked to pasteurized cheese products, according to a study.
The incident highlights the risk for recontamination of cheese during manufacturing and emphasizes the need for routine sampling of products, manufacturing equipment, and the production environment, said researchers in the journal Emerging Infectious Diseases.
The two year outbreak of Listeria monocytogenes also caused 34 laboratory-confirmed cases. The nationwide incident was traced to persistent environmental contamination of a dairy with Listeria monocytogenes. Results of an investigation implicated the Käserei Vogel dairy that had sanitation shortcomings at the production site in Steinerberg, Schwyz.
Initial investigation didn’t find source
In 2018, the Swiss Federal Office of Public Health (SFOPH) recorded 52 cases of listeriosis. However, from March 6 to July 31, 2018, an increase of Listeria monocytogenes serotype 4b with 13 cases was recorded. Whole genome sequencing (WGS) was performed on these … Read more