STEC Infections: Food, Travel, and Rising Cases
STEC Infections Surge in England: UKHSA Reports 26% Rise in 2024
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London, UK – England has witnessed a important increase in Shiga toxin-producing Escherichia coli (STEC) infections in 2024, with a 26% rise in culture-confirmed cases compared to the previous year. New figures released by the UK Health Security Agency (UKHSA) reveal a total of 2544 cases, a stark jump from the 2018 cases recorded in 2023.
Key Findings: A Growing public Health Concern
The latest data highlights a concerning trend in STEC infections, with both O157 and non-O157 strains contributing to the overall increase.
Non-O157 Strains Drive the Surge
A substantial portion of the rise is attributed to non-O157 STEC infections. These strains accounted for 1980 of the confirmed cases. The UKHSA points to a major outbreak linked to contaminated salad leaves as a significant factor in this increase. This particular outbreak led to 293 confirmed cases, 126 hospitalisations, 11 instances of haemolytic uraemic syndrome (HUS), and tragically, two deaths.
Dr. Gauri Godbole, a consultant microbiologist and deputy director for gastrointestinal infections at the UKHSA, commented on the situation: “While this rise is partly due to one foodborne outbreak, we have been seeing STEC cases gradually increase since 2022.”
travel-Linked Cases Also Rising
Travel-related STEC cases have also seen a notable increase, rising by 60.5% from 114 in 2023 to 183 in 2024. The UKHSA suggests this could be due to changes in international travel patterns or improved data collection regarding travel history during investigations, though the exact cause remains under review.
Long-term Trends and Vulnerable Populations
Examining longer-term trends reveals a shift in STEC infection patterns.
Shifting Patterns in O157 and Non-O157 Cases
Between 2015 and 2021,confirmed O157 cases had been on a downward trend.Though, recent years have seen an increase in these numbers. Conversely,non-O157 STEC infections have been on a continuous upward trajectory since 2021,nearly tripling since 2019 and continuing a pre-pandemic trend.
Children Remain Most Affected
Consistent with 2023, children aged 1 to 4 years continue to be the most affected age group for both O157 and non-O157 STEC cases. The UKHSA attributes this to several factors, including limited prior immunity, developing hygiene practices, and a higher likelihood of parents seeking medical attention for symptomatic young children.Contact with animals, especially at petting farms, is also considered a potential contributing factor.
Understanding STEC: Causes, Transmission, and Outcomes
STEC infections, while often manageable, can led to severe complications.
The Reservoir and Transmission Routes
Cattle are the primary reservoir for STEC, though other ruminants like sheep, goats, and deer also carry the bacteria. Transmission can occur through various routes:
Direct or indirect contact with infected animals or their faeces.
Consumption of contaminated food or water.
* Person-to-person spread, particularly in settings with close contact.
Investigated outbreaks and Identified Sources
in 2024, the UKHSA and its partner agencies investigated five outbreaks of non-O157 STEC. The sources for three of these outbreaks were identified as contaminated beef, fresh fruit, and salad leaves.
Symptoms and Severe complications
STEC infections typically cause gastroenteritis, with symptoms ranging from mild to severe, including diarrhoea (often bloody), stomach cramps, vomiting, and dehydration.In severe cases, the infection can progress to HUS, a life-threatening condition that can lead to kidney failure.
hospitalisation and Mortality Rates
The UKHSA reports that hospitalisation was necessary for 27.5% of O157 cases and 34.3% of non-O157 cases. HUS occurred in 2.1% of O157 cases and 1.7% of non-O157 cases.Tragically,a total of