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Foodborne transmission of Listeria monocytogenes via ready-to-eat salad: a nationwide outbreak in Switzerland, 2013-2014

Stephan, Roger; Althaus, Denise; Kiefer, Sabine; Lehner, Angelika; Hatz, Christoph; Schmutz, C; Jost, Marianne; Gerber, N; Baumgartner, Andreas; Hächler, Herbert; Mäusezahl-Feuz, Mirjam (2015). Foodborne transmission of Listeria monocytogenes via ready-to-eat salad: a nationwide outbreak in Switzerland, 2013-2014. Food Control, 57:14-17.

Abstract

From 26 October 2013 to 23 April 2014, 32 cases of listeriosis infected with an Listeria monocytogenes strain serovar 4b, sequence type 4 and belonging to a single distinct PFGE pulsotype were registered in patients from several cantons of Switzerland. L. monocytogenes was detected in blood (75%), CSF (16%), ascites (6%) and in joint fluid (3%) samples. By the end of March 2014, a food producing company reported an L. monocytogenes contamination of ready-to-eat salads to the authorities after detecting the pathogen through its in-house routine quality control. Product and environmental samples collected during subsequent investigations yielded isolates, matching the outbreak strain, thus confirming that ready-to-eat salad from this company was most likely the outbreak source. The cause for the product contamination was related to a design-inherent hygienic problem of one specific product-feeding belt. Complementary patient interviews also identified ready-to-eat green salads bought at one retailer as the likely outbreak source

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:04 Faculty of Medicine > Epidemiology, Biostatistics and Prevention Institute (EBPI)
05 Vetsuisse Faculty > Veterinärwissenschaftliches Institut > Institute of Food Safety and Hygiene
Dewey Decimal Classification:570 Life sciences; biology
610 Medicine & health
Scopus Subject Areas:Life Sciences > Biotechnology
Life Sciences > Food Science
Uncontrolled Keywords:Listeria monocytogenes outbreak, Serotype 4b, ST 4, Ready-to-eat salad
Language:English
Date:2015
Deposited On:19 Feb 2016 17:05
Last Modified:15 Oct 2024 01:37
Publisher:Elsevier
ISSN:0956-7135
OA Status:Closed
Publisher DOI:https://doi.org/10.1016/j.foodcont.2015.03.034

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