Salmonella cases in UK likely to rise until source of outbreak is found

Salmonella cases in the United Kingdom are expected to continue rising until public health officials can locate the source of an outbreak that has already infected hundreds of people and caused one death, experts have warned.

According to the UK Health Security Agency, 474 cases of salmonella poisoning and one death have been confirmed in connection with the current surge. Preliminary investigations suggest the infections are linked to imported eggs served in food service establishments, including cafes, restaurants, takeaways, schools, and nursing homes.

Tracing the precise origin of the contamination is proving particularly difficult, leading food safety experts to caution that the number of illnesses could grow for weeks.

Professor Chris Elliott, a food safety expert at Queen’s University Belfast, said tracing ingredients within the catering and food service industry presents significantly greater challenges than doing so in the retail sector, where supply chains are more strictly monitored. Elliott noted that health agencies face immense pressure and expressed expectation that case numbers will continue to rise until authorities can trace the supply back to the specific producer and country of origin.

Data from the British Egg Industry Council shows that the UK imports approximately 1.6 billion eggs annually, representing a 60 percent increase since 2021. Experts attribute the widespread use of these eggs in catering to their lower cost when purchased in bulk compared to domestic eggs bearing the British Lion Quality mark.

Paul Wigley, a professor of animal microbial ecosystems at the University of Bristol, stated that bulk imported eggs are frequently used in commercial kitchens, schools, and care facilities. Wigley noted that the clustering of cases points toward a single source. He added that consumer options for protection remain limited, suggesting that individuals may want to avoid consuming runny eggs outside the home unless they are certified under the Lion Mark scheme.

Health professionals have expressed heightened concern regarding the scale and synchronization of the current outbreak. Professor Mark Stevens, chair of microbial pathogenesis at the University of Edinburgh, described the situation as unusual, noting that while thousands of salmonella cases occur in the UK every year, it is rare to see hundreds of people infected simultaneously by a single common strain.

Professor Brad Spiller, head of medical microbiology at Cardiff University, highlighted that identifying the source country will be critical to stopping the spread. Spiller pointed out that previous salmonella outbreaks in recent years were successfully resolved only after investigators traced the contaminated products back to producers in Poland.

Health protection agencies continue their investigations to isolate the strain and restrict its entry into the food supply chain, though experts emphasize that until the source country and supplier are identified, the outbreak is unlikely to cease naturally.