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Outbreak of unusual H2S-negative monophasic Salmonella Typhimurium strain likely associated with small tomatoes, Sweden, August to October 2019
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View Affiliations Hide AffiliationsSoledad Colombesoledad.colombe folkhalsomyndigheten.se
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View Citation Hide Citation
Citation style for this article: . Outbreak of unusual H2S-negative monophasic Salmonella Typhimurium strain likely associated with small tomatoes, Sweden, August to October 2019. Euro Surveill. 2019;24(47):pii=1900643. https://doi.org/10.2807/1560-7917.ES.2019.24.47.1900643 Received: 21 Oct 2019; Accepted: 14 Nov 2019
Abstract
Sweden is investigating an outbreak of monophasic Salmonella Typhimurium. Eighty-two nationally-distributed cases have been confirmed, with date of symptom onset between 28 August and 29 October. Cases were 51 years of age on average (range: 0–89) and the majority of cases were female (62%). A case–control study was conducted and suggested small tomatoes as source of the outbreak (adjusted odds ratio (OR): 10.8, 95% confidence interval (CI): 4.15-112.68, p value < 0.001), and a trace-back investigation led to a single, non-Swedish producer in Europe. Both the Salmonella strain and the source of the outbreak are rarely encountered in Europe. Results from investigation at the producer are pending.
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