Outbreak of Salmonella Newport linked to imported frozen cooked crayfish in dill brine, Sweden, July to November 2019.

Autor:	Jansson Mörk M; Public Health Agency of Sweden, Solna, Sweden.; European Programme for Intervention Epidemiology Training (EPIET), European Centre for Disease Prevention and Control (ECDC), Solna, Sweden., Karamehmedovic N; Public Health Agency of Sweden, Solna, Sweden., Hansen A; Public Health Agency of Sweden, Solna, Sweden., Nederby Öhd J; County Council Department of Communicable Disease Control and Prevention, Stockholm Region, Stockholm, Sweden., Lindblad M; Swedish Food Agency, Uppsala, Sweden., Östlund E; National Veterinary Institute, Uppsala, Sweden., Rehn M; Public Health Agency of Sweden, Solna, Sweden., Jernberg C; Public Health Agency of Sweden, Solna, Sweden.
Jazyk:	angličtina
Zdroj:	Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin [Euro Surveill] 2022 Jun; Vol. 27 (22).
DOI:	10.2807/1560-7917.ES.2022.27.22.2100918
Abstrakt:	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.
Databáze:	MEDLINE
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