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Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019
In autumn 2019, the Public Health Agency of Sweden identified a cluster of Salmonella Newport cases by whole genome sequencing (WGS). Cases’ distribution in place and time indicated a nation-wide ongoing outbreak. An investigation was initiated to identify the source and prevent further cases. We co...
Autores principales: | , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
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European Centre for Disease Prevention and Control (ECDC)
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9164673/ https://www.ncbi.nlm.nih.gov/pubmed/35656829 http://dx.doi.org/10.2807/1560-7917.ES.2022.27.22.2100918 |
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author | Jansson Mörk, Marie Karamehmedovic, Nadja Hansen, Anette Nederby Öhd, Joanna Lindblad, Mats Östlund, Emma Rehn, Moa Jernberg, Cecilia |
author_facet | Jansson Mörk, Marie Karamehmedovic, Nadja Hansen, Anette Nederby Öhd, Joanna Lindblad, Mats Östlund, Emma Rehn, Moa Jernberg, Cecilia |
author_sort | Jansson Mörk, Marie |
collection | PubMed |
description | In autumn 2019, the Public Health Agency of Sweden identified a cluster of Salmonella Newport cases by whole genome sequencing (WGS). Cases’ distribution in place and time indicated a nation-wide ongoing outbreak. An investigation was initiated to identify the source and prevent further cases. We conducted a case–case study based on notified salmonellosis cases and a Salmonella trawling questionnaire, comparing 20 outbreak cases and 139 control cases. Food exposures were compared by adjusted odds ratios (aOR) with 95% confidence interval (CI) using logistic regression. Implicated foods were sampled. Outbreak cases were more likely to have consumed crayfish (aOR = 26; 95% CI: 6.3–105). One specific brand of imported frozen, pre-cooked whole crayfish in dill brine was identified as the source. Salmonella Newport was later detected in different batches from retail and in one sample from border control. Isolates from food samples clustered with the human outbreak strain by WGS. Although the retailer made a complete recall, two more cases were identified long afterwards. This investigation demonstrated the successful use of a case–case study and targeted microbiological testing to identify the source. The immediate action taken by the retailer was important to confirm the source and stop the outbreak. |
format | Online Article Text |
id | pubmed-9164673 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2022 |
publisher | European Centre for Disease Prevention and Control (ECDC) |
record_format | MEDLINE/PubMed |
spelling | pubmed-91646732022-06-14 Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 Jansson Mörk, Marie Karamehmedovic, Nadja Hansen, Anette Nederby Öhd, Joanna Lindblad, Mats Östlund, Emma Rehn, Moa Jernberg, Cecilia Euro Surveill Outbreaks In autumn 2019, the Public Health Agency of Sweden identified a cluster of Salmonella Newport cases by whole genome sequencing (WGS). Cases’ distribution in place and time indicated a nation-wide ongoing outbreak. An investigation was initiated to identify the source and prevent further cases. We conducted a case–case study based on notified salmonellosis cases and a Salmonella trawling questionnaire, comparing 20 outbreak cases and 139 control cases. Food exposures were compared by adjusted odds ratios (aOR) with 95% confidence interval (CI) using logistic regression. Implicated foods were sampled. Outbreak cases were more likely to have consumed crayfish (aOR = 26; 95% CI: 6.3–105). One specific brand of imported frozen, pre-cooked whole crayfish in dill brine was identified as the source. Salmonella Newport was later detected in different batches from retail and in one sample from border control. Isolates from food samples clustered with the human outbreak strain by WGS. Although the retailer made a complete recall, two more cases were identified long afterwards. This investigation demonstrated the successful use of a case–case study and targeted microbiological testing to identify the source. The immediate action taken by the retailer was important to confirm the source and stop the outbreak. European Centre for Disease Prevention and Control (ECDC) 2022-06-02 /pmc/articles/PMC9164673/ /pubmed/35656829 http://dx.doi.org/10.2807/1560-7917.ES.2022.27.22.2100918 Text en This article is copyright of the authors or their affiliated institutions, 2022. https://creativecommons.org/licenses/by/4.0/This is an open-access article distributed under the terms of the Creative Commons Attribution (CC BY 4.0) Licence. You may share and adapt the material, but must give appropriate credit to the source, provide a link to the licence, and indicate if changes were made. |
spellingShingle | Outbreaks Jansson Mörk, Marie Karamehmedovic, Nadja Hansen, Anette Nederby Öhd, Joanna Lindblad, Mats Östlund, Emma Rehn, Moa Jernberg, Cecilia Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title | Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title_full | Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title_fullStr | Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title_full_unstemmed | Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title_short | Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019 |
title_sort | outbreak of salmonella newport linked to imported frozen cooked crayfish in dill brine, sweden, july to november 2019 |
topic | Outbreaks |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9164673/ https://www.ncbi.nlm.nih.gov/pubmed/35656829 http://dx.doi.org/10.2807/1560-7917.ES.2022.27.22.2100918 |
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