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Swiss Listeria outbreak shows risk of cheese recontamination

A multi-365 days Listeria outbreak in Switzerland that killed 10 of us modified into linked to pasteurized cheese merchandise, in accordance to a peep.

The incident highlights the threat for recontamination of cheese at some level of manufacturing and emphasizes the need for routine sampling of merchandise, manufacturing equipment, and the manufacturing ambiance, said researchers in the journal Rising Infectious Diseases.

The 2 365 days outbreak of Listeria monocytogenes also triggered 34 laboratory-confirmed instances. The nationwide incident modified into traced to chronic environmental contamination of a dairy with Listeria monocytogenes. Results of an investigation implicated the Käserei Vogel dairy that had sanitation shortcomings on the manufacturing bag of residing in Steinerberg, Schwyz.

Preliminary investigation didn’t gain source


In 2018, the Swiss Federal Reveal of work of Public Smartly being (SFOPH) recorded 52 instances of listeriosis. Nonetheless, from March 6 to July 31, 2018, an amplify of Listeria monocytogenes serotype 4b with 13 instances modified into recorded. Total genome sequencing (WGS) modified into performed on these lines. Twelve of 13 isolates were carefully linked.

An outbreak investigation modified into began by the SFOPH and patients were contacted to evaluate meals exposures by the utilization of a standardized questionnaire. Nonetheless, the investigation did now not lead to a suspect meals, and the auto of an infection remained unknown.

In a 2nd wave, onset dates ranged from Jan. 22 to May per chance presumably presumably 26, 2020. One other 27 infections with Listeria monocytogenes serotype 4b were recorded; four were clinic patients who had underlying instances. Questionnaire-essentially based entirely recordsdata weren’t accessible to make stronger a meals hypothesis. A total of 22 lines grouped in a tight cluster on the inspiration of WGS.

Median age of the patients modified into 81 with a range of lower than 1 to 99 years ragged. Eighteen of 34 affected of us were ladies folk. One case of transmission from the mother to the baby shut to the initiating and 10 deaths were reported.

In boring April 2020, Käserei Vogel reported to the cantonal laboratory it had detected Listeria monocytogenes from a pattern of mushy (brie) cheese manufactured from pasteurized milk. Diagnosis modified into fragment of the manufacturer’s routine high-quality controls, which would be important in Switzerland. The cheese isolate matched the outbreak stress when put next by WGS.

WGS helped existing shut relatedness between isolates from cheese and the ambiance, and hyperlink the listeriosis instances from 2018 to the 2020 outbreak.

Isolation and WGS typing of Listeria monocytogenes from this high-quality bag watch over cheese pattern supplied the largest recordsdata that enabled the starting bag of contamination to be identified, in accordance to researchers.

Sampling findings


Authorities traced the distribution chain of the dairy. The producer supplied several investors who supplied cheese to retailers during Switzerland. Investors were told to forestall initiating of merchandise from the producer.

Findings triggered environmental sampling on the manufacturing bag of residing of Käserei Vogel. A total of 50 swab specimens from vats, cheese harps, skimming gadgets, sink drains, brushes, scrub sponges, trays, door handles, ripening cellar floor, and partitions were taken.

Listeria monocytogenes modified into identified in 11 environmental samples, and all five sequenced isolates matched the outbreak stress. These outcomes led to a rob in early May per chance presumably presumably of 26 objects, including brie, sheep and goat cheese, and organic cheeses and manufacturing modified into stopped.

After the rob of implicated merchandise and a public warning by the Federal Food Security and Veterinary Reveal of work, seven instances of listeriosis triggered by the outbreak stress were recorded. The final known patient modified into sampled on May per chance presumably presumably 20 and reported to SFOPH on May per chance presumably presumably 25, 2020.

In August, the Schwyz Public Prosecutor’s Reveal of work opened criminal proceedings in reference to the incident to ascertain allegations against the owner of the cheese firm.

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