The UK Health Security Agency is investigating a growing salmonella outbreak that has affected multiple people across the country. Imported eggs or dishes containing them are considered the primary suspects, with evidence suggesting infections occurred primarily through foodservice venues such as restaurants, cafes, and takeaways rather than home-prepared meals.
Salmonella bacteria typically inhabit the digestive tracts of animals including poultry, cattle, and pigs, which explains why eggs and poultry are frequently associated with infections. The bacteria can be transmitted through consuming undercooked contaminated food, drinking contaminated water, contact with infected animals, or cross-contamination between raw and cooked foods. Symptoms typically include stomach cramps, diarrhea, vomiting, or fever, developing within 12 to 72 hours of infection. Most people recover without intervention, though older individuals, infants, and immunocompromised persons face greater risk of severe illness.
Genetic analysis using whole-genome sequencing revealed that bacteria from current cases are closely related, differing by only a handful of DNA sequences. This indicates a common source outbreak. Investigators identified links to five unnamed food businesses, some where diners reported consuming egg-containing dishes. Premises under investigation are believed to source eggs from multiple suppliers, including imported sources. The UKHSA stated there is currently no identified link to UK-produced eggs or poultry.
Prevention measures include thorough cooking of eggs, hand washing before food preparation and after bathroom use, and proper hygiene during food handling. Vulnerable populations are advised to consume only eggs bearing the British Lion mark or produced under the Laid in Britain scheme. UK hen vaccination programs initiated in the mid-1990s and the British Lion Scheme established in 1998 have substantially reduced egg-associated salmonella infections domestically. However, imported eggs and egg products may lack equivalent safety controls from their countries of origin.
Investigations remain ongoing, with authorities working to confirm eggs as the source, trace the supply chain, identify countries of origin, and determine factors contributing to the outbreak’s rapid growth. Local authorities are conducting tests on suspected businesses and opportunistic sampling. The UKHSA has alerted international partners to monitor for genetically similar infections.
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