Full Breakdown
Salmonella Outbreaks Tied to Egg Supplies in the United Kingdom and California
8/19/2026, 11:34:25 AM
Overview of the Outbreaks
In the United Kingdom, a salmonella outbreak affecting 207 people—including one fatality—has been linked to eggs imported from outside the country. The UK Health Security Agency (UKHSA) has been conducting “extensive” epidemiological and food-chain investigations since the first case was identified on 11 August 2025.
In California’s San Diego County, a separate outbreak linked to raw, unpasteurised eggs used in house-made mayonnaise at Ramona Family Naturals Market has grown to 21 confirmed cases, with seven hospitalisations. The county first announced the outbreak on 28 July 2026 and identified the egg supplier Happy Hens as the probable source.
Both incidents involve a single strain of salmonella identified through whole-genome sequencing and have prompted public-health alerts in their regions.
Data & Statistics
| Region | Total cases | Hospitalisations | Deaths | Primary exposure |
|---|---|---|---|---|
| United Kingdom | 207 (11 Aug 2025 – 1 Aug 2026) | > 34 % required hospital care | 1 | Food prepared with imported eggs |
| San Diego County, CA | 21 (as of 17 Aug 2026) | 7 | 0 | Mayonnaise made with raw eggs from Happy Hens |
Background & Context
Salmonella bacteria cause gastroenteritis, with symptoms appearing 12–72 hours after ingestion. Vulnerable groups—infants, the elderly and immunocompromised individuals—are at higher risk of severe disease.
In the UK, imported eggs are subject to less stringent vaccination and monitoring than domestically produced eggs, which must undergo mandatory salmonella vaccination. In California, the Retail Food Code requires foods not thoroughly cooked, such as mayonnaise, to be prepared with pasteurised eggs or a written variance.
Official Statements & Responses
- San Diego County’s Department of Environmental Health and Quality issued a bulletin urging retailers that may have received Happy Hens eggs to follow proper storage, grading and resale guidelines, and reminded the public to cook eggs thoroughly and practice hand-washing.
- The county noted that the outbreak strain is unrelated to a concurrent Midwest poultry-related salmonella outbreak.
Criticism & Opposition
Chloe Nevarez, owner of Happy Hens, disputed the county’s findings, stating that “all nine of those people had salmonella from either chicken or eggs, but how that links back to our farm is null and void. There is no connection.”
Conflicting Reports & Gaps
- The county’s statements did not disclose the specific laboratory evidence used to connect Happy Hens eggs to the outbreak.
- In the UK, the precise country of origin and distribution network of the implicated imported eggs have not been publicly identified.
What’s Next
- UKHSA continues investigations and indicated that additional precautionary measures will be implemented if needed; no recall of imported eggs has been announced.
- San Diego County will maintain outreach to retailers that may have received Happy Hens eggs, continue monitoring for new cases, and enforce compliance with the Retail Food Code.
Both outbreaks illustrate the challenges of tracing food-borne pathogens across complex supply chains and underscore the importance of stringent egg-handling standards to protect public health.
