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Salmonella Stanley (May-June 2026)

Background 

  • Pathogen : Salmonella Stanley, a serotype/variant of Salmonella. Salmonella bacteria causes gastrointestinal illness, commonly with fever and diarrhoea.

  • Transmission: Mainly through contaminated food or contact with infected animals. Person-to-person spread can occur via faecal contamination, but secondary cases are relatively uncommon. For more information, please see the dedicated page on the outbreak from the Swedish Health Agency (Folhälsomyndigheten).

  • Sources and risk factors: Possible sources include contaminated foods such as meat, chicken, eggs, fruit, vegetables, nuts, spices, and other foods where bacteria can multiply. Small children, older adults, and immunocompromised people are more vulnerable to severe disease.

  • Seasonality: There is no seasonality to infections. Salmonella outbreaks are generally more linked to contaminated food, food handling, and storage conditions than to a fixed season.

Brief Summary of the Outbreak

In May–June 2026, Sweden detected a cluster of Salmonella Stanley infections. Whole-genome sequencing showed that the cases carried the same bacterial strain, suggesting a common source. In total, 18 people from six Swedish regions became ill between 23 May and 3 June. The suspected source was a food product with limited shelf life, but no specific source was identified. Since no new cases had been detected for two weeks, the outbreak was assessed as over on 8 July 2026.Folkhälsomyndigheten has created a page on the outbreak.

Outbreak Timeline 

YEAR DATE OBSERVATION
2026 23 May–3 June Eighteen people became ill, or were sampled, with infection caused by the same strain/variant of Salmonella Stanley.
2026 Late May The first signal of the outbreak emerged; by the last week of May, cases were being confirmed.
2026 23 June Seventeen confirmed cases were reported. Whole-genome sequencing showed that the cases had the same strain, suggesting a common source. The source was suspected to be a widely distributed food product.
2026 8 July The outbreak was assessed as over. A total of eighteen cases were identified across six regions; ages ranged from 17–84 years, median age 68, and 11 were women. The source was not identified but was suspected to be a short-shelf-life food no longer on the market.