Foodborne transmission of Listeria monocytogenes via ready-to-eat salad: A nationwide outbreak in Switzerland, 2013–2014 |
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| Affiliation: | 1. Istituto Zooprofilattico Sperimentale della Lombardia e dell''Emilia Romagna (IZSLER), Via Bianchi no. 9, 25124 Brescia, Italy;2. Istituto Zooprofilattico Sperimentale di Lazio e Toscana (IZSLT), via Appia Nuova 1411, 00178 Rome (Capannelle), Italy;3. Istituto Zooprofilattico Sperimentale del Mezzogiorno, Via Salute, 2, 80055 Portici (Naples), Italy;4. Istituto Zooprofilattico Sperimentale dell''Umbria e delle Marche (IZSUM), Via G. Salvemini, no. 1, 06126 Perugia, Italy;5. Istituto Zooprofilattico Sperimentale delle Venezie (IZSVe), Viale dell''Universita'', 10-35020 Legnaro (Padua), Italy;6. Istituto Zooprofilattico Sperimentale della Sicilia, Via G.Marinuzzi, 3, 90129 Palermo, Italy;7. Istituto Zooprofilattico Sperimentale del Piemonte, Liguria e Valle d''Aosta (IZSPLV), via Bologna, 148, 10154 Turin, Italy;8. Istituto Zooprofilattico Sperimentale della Puglia e della Basilicata (IZSPB), via Manfredonia, n. 20, 71121 Foggia, Italy;9. Istituto Zooprofilattico Sperimentale della Sardegna, Via Duca degli Abruzzi 8, 07100 Sassari, Italy;10. Istituto Superiore di Sanità (ISS), viale Regina Elena, 299, 00161 Rome, Italy;1. Food Hygiene and Technology Department, Faculty of Veterinary Medicine, Afyon Kocatepe University, Afyonkarahisar, Turkey;2. Food Hygiene and Technology Department, Faculty of Veterinary Medicine, Erciyes University, Kayseri, Turkey |
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| 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. |
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| Keywords: | Serotype 4b ST 4 Ready-to-eat salad |
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