Salmonella outbreak: What we know so far

An ongoing salmonella food poisoning outbreak in the UK has left multiple individuals ill, with evidence pointing to imported eggs as the primary source. The UK Health Security Agency (UKHSA) is investigating the situation, with a focus on catered and restaurant settings, such as restaurants, cafes, and takeaways. Salmonella bacteria are commonly found in animal digestive tracts, which explains why eggs and poultry are often associated with the infection.

Symptoms typically appear within 12 to 72 hours of consuming contaminated food and include stomach cramps, diarrhea, vomiting, and fever. Most patients recover without medical intervention, but vulnerable populations like the elderly, infants, and immunocompromised individuals face increased risks of severe disease. Hospital care and antibiotics may be necessary in these cases.

To prevent infection, thorough cooking of eggs and other foods is crucial, along with proper handwashing before and after food preparation, bathroom use, and contact with animals. The Food Standards Agency recently provided guidance to caterers on egg storage and handling. Most of the recent cases have been reported in England, including London and Yorkshire and Humber, with some instances in Scotland, Wales, and Northern Ireland.

Genetic testing reveals that the bacteria causing the outbreak are closely related, indicating a common source. Preliminary findings suggest that eggs are the most likely culprit, with connections to five businesses or food outlets. While there is no indication of UK-produced eggs or poultry being involved, local authorities are investigating hygiene practices at implicated premises.

Public health experts emphasize the importance of cooking eggs thoroughly and maintaining proper hygiene to prevent infection. Vaccination programs for commercial hens in the UK have significantly reduced egg-associated salmonella cases since the mid-1990s. However, the UK still imports a significant number of eggs, and salmonella could still be present if the producing countries lack adequate control measures.

Mark Williams, chairman of the British Egg Industry Council, advises food businesses importing eggs to verify vaccination information and adhere to all food safety checks. The UKHSA continues to interview those affected and conduct tests on implicated businesses and supplies to trace the source and prevent further infections.