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

Salmonella cases in the UK are on track to increase until the source of the outbreak is discovered, warned experts. There have been 474 confirmed cases and one death associated with the current outbreak, according to the UK Health Security Agency (UKHSA). The latest investigations suggest that the source may be linked to the consumption of imported eggs in cafes and restaurants.

Every year, about 1.6 billion eggs are imported to the UK, a number that has risen by 60% since 2021. Paul Wigley, a professor of animal microbial ecosystems at the University of Bristol, explained that bulk purchases of imported eggs, which are cheaper than UK lion mark eggs, can lead to their use in various catering establishments.

The clustering of cases suggests a single source, according to Wigley. He added that identifying the source would help in implementing specific controls on producers or countries. However, as the source of this outbreak remains unidentified, the situation is particularly worrying for some experts. Prof Chris Elliott of Queen’s University Belfast stated that the likelihood of the outbreak being imported is high, and tracing the origin of such an issue in the food service industry is extremely difficult.

He also pointed out that the number of cases would keep rising until the source is identified, which could take weeks. Prof Brad Spiller, the head of medical microbiology at Cardiff University, emphasized that having a common source is the most concerning aspect of the outbreak. He stated that once the countries involved are better understood, the source can be tracked back.

Prof Mark Stevens, the chair of microbial pathogenesis at the University of Edinburgh, noted that the occurrence of cases at the same time is unusual and poses a challenge for health protection agencies. He highlighted the concern of an outbreak of this scale, with thousands of salmonella cases occurring each year, but rarely at such a large scale.