A severe outbreak of E. coli that swept across the United Kingdom in the summer of 2023, resulting in one death and dozens of severe illnesses, has now been traced back to a probable source – minced beef products.
The outbreak, according to a recent article in The Sun, which was initially detected by the UK Health Security Agency’s (UKHSA) surveillance systems in June 2023, was caused by a rare strain of Shiga toxin-producing Escherichia coli, or STEC. This strain is known for causing severe gastrointestinal symptoms, including bloody diarrhea, abdominal pain, fever, and vomiting.
Early on, officials suspected various food items as potential sources, including hard cheese, strawberries, cucumbers, peppers, and watermelon. However, pinpointing the exact origin of the contamination proved challenging.
A report published in the journal Microbial Genomics has now shed light on the likely culprit – beef burgers or minced beef products. The findings are based on an extensive investigation and a process of elimination.
From May to July 2023, 27 cases and one probable case associated with the STEC outbreak were confirmed by authorities.
Tragically, one person developed hemolytic uremic syndrome (HUS), a rare condition that can lead to kidney failure. Another individual died, but the death certificate did not clarify if STEC was a cause or contributing factor.
The cases spanned a wide age range, from six months to 74 years, with almost half confirmed in children aged nine and under. The outbreak was geographically widespread, with cases reported across England, Northern Ireland, Scotland, and Wales.
Symptoms experienced by the patients varied, with 17 out of 24 individuals reporting bloody diarrhea, and eight requiring hospitalization. Researchers also collected data on the dietary habits of half the patients, with 68% reporting consuming cooked chicken in advance of their illness.
While the precise source of contamination remains elusive, the investigation has narrowed down the likely culprit to minced beef products. Ten of the patients filled out questionnaires to provide a detailed account of their food history for the two weeks leading up to the onset of sickness. All 10 reported eating either beef burgers, beef mince prepared at home, or other beef mince products.
An investigation into the beef industry supply chain by the UK’s Food Standards Agency (FSA) to identify the source of the contamination was unsuccessful due to industry complexity and limited laboratory resources for proper testing in England. It is also still unknown whether the contaminated products were of domestic or foreign origin.
Commenting on this story, one national food safety attorney said, “Although the source of the contamination was not discovered, I applaud the UK’s food safety authorities for sharing the results of their investigation with the public. Hopefully they will implement targeted measures to prevent similar outbreaks in the future and raise awareness about proper handling and cooking practices for these high-risk foods.”
