E. coli Outbreak Epidemiology Forecast 2026-2035

Parameter

Insight

Largest Patient Pool

Germany

Fastest Growing Country

United States

High-Risk Population

Children, particularly those under 5 years; older adults; people exposed to contaminated food or water; and individuals with immunocompromising conditions.

Key Diagnostic Method

Multiplex gastrointestinal PCR or Shiga-toxin detection followed by culture and whole-genome sequencing (WGS) for confirmation, serotyping and outbreak linkage.

Major Risk Factor

Consumption of contaminated food or water, particularly undercooked beef, unpasteurized dairy, leafy vegetables, fresh produce and contaminated drinking water.

Major gap in the market

Delayed case recognition, incomplete pathogen isolation after PCR diagnosis, heterogeneous surveillance, limited source attribution and continued under-recognition of non-O157 STEC and non-STEC diarrhoeagenic E. coli.

Epidemiology Segment

Key Insights

Diagnosed Prevalent Cases of the Disease

Conventional prevalence is not an appropriate measure for an outbreak. Surveillance instead uses confirmed outbreak-associated cases. EU surveillance recorded 11,738 confirmed STEC infections in 2024, while 31 foodborne STEC outbreaks generated 158 outbreak-associated cases

Gender-Specific Cases of the Disease

In England in 2025, 306/568 (53.9%) confirmed O157 cases were female. Sex distribution varies substantially by outbreak; the 2023 West Sikkim STEC outbreak in India involved 30 male cases because the affected population was an army camp.

Age-Specific Cases of the Disease

Young children are disproportionately affected by severe STEC disease. In England in 2025, children aged 1-4 years had the highest O157 incidence at 3.60/100,000. In the EU, children aged 0–4 years represented the largest HUS burden, while older adults had a disproportionate share of fatal HUS outcomes.

Ethnicity-Wise Cases of the Disease

No harmonized 8MM ethnicity-specific outbreak dataset is available. U.S. FoodNet surveillance collects race and ethnicity for laboratory-confirmed STEC infections, but outbreak-specific ethnicity distributions are not directly comparable with European or Indian surveillance systems.

Mortality and Survival Analysis of the Disease

EU surveillance recorded 25 deaths among 11,738 confirmed STEC infections in 2024. England reported no deaths among O157 cases and three deaths among non-O157 STEC cases in 2025. The 2024 UK O145 outbreak caused 2 deaths and 11 HUS cases among 293 confirmed cases. The 2025 German O45 outbreak had two confirmed deaths by 22 October, with an additional probable fatal case under investigation.

Disease Type

Prevalence

Asymptomatic STEC Infection

Laboratory-confirmed infection without clinically apparent gastrointestinal disease, frequently detected through contact or outbreak screening. Although symptoms may be absent, infected individuals can still carry and transmit STEC, making case identification important for outbreak control.

Acute Uncomplicated STEC Gastroenteritis

Diarrheal illness with abdominal pain, nausea or vomiting without hemorrhagic colitis or HUS. In 2023, FoodNet identified 3,351 STEC infections within its surveillance area, although this figure includes the broader spectrum of clinically recognized STEC infections rather than uncomplicated gastroenteritis alone.

Hemorrhagic Colitis

Severe STEC-associated intestinal disease characterized by abdominal cramping and bloody diarrhea. Patients may develop marked abdominal tenderness, fever, and dehydration, with some progressing to hemolytic uremic syndrome (HUS).

STEC Infection with HUS

Systemic complication involving microangiopathic hemolytic anemia, thrombocytopenia and acute kidney injury; disproportionately affects young children. In the FoodNet surveillance area, 61 post-diarrhoeal HUS cases among people aged <18 years were identified in 2022, including 39 cases among children aged <5 years. The incidence was 0.6 per 100,000 among those aged <18 years and 1.4 per 100,000 among children aged <5 years.

Country

Key Insights

United States

FoodNet 2024 preliminary surveillance identified 3,635 STEC infections within its approximately 16% population surveillance area. Current 2026 investigations include a sprout-associated outbreak involving 55 total illnesses, four hospitalizations and no deaths, and a raw-milk-cheese O26 outbreak involving 13 illnesses, 8 hospitalizations and 3 HUS cases as of 25 September 2026.

Germany

Germany reported 4,458 notified STEC infections in 2023, with increased detection associated in part with multiplex PCR implementation. A major O45 outbreak emerged in 2025. By 22 October 2025, 183 confirmed cases, including 48 HUS cases, were linked to the outbreak; 8 probable and 160 possible cases were additionally under investigation. Two confirmed deaths and one probable death had been reported at that stage.

France

France participates in EU STEC surveillance, but its system is voluntary and sentinel rather than fully population-comprehensive. Notification rates are therefore not calculated in the ECDC/EFSA comparison; surveillance is primarily based on HUS and selected STEC surveillance rather than providing a directly comparable national incidence denominator.

Italy

Italy similarly operates a sentinel STEC surveillance system primarily focused on HUS rather than comprehensive population-wide STEC infection. The Italian HUS registry recorded 57 HUS cases in 2024, with the overwhelming majority occurring in children and adolescents. The surveillance structure means these figures should not be compared directly with comprehensive STEC notification counts from Germany, Spain or the UK.

Spain

Spain reported 844 confirmed STEC infections in 2024, corresponding to 1.7 cases per 100,000 population; estimated population coverage was approximately 97%. Spain was also one of the principal EU countries identified as a probable country of infection among imported EU-acquired STEC cases.

United Kingdom

England reported 2,544 culture-confirmed STEC infections in 2024 and 2,457 in 2025. The 2024 national outbreak series comprised five outbreaks involving 467 people, including a UK-wide O145 outbreak of 293 confirmed cases, 11 HUS cases and 2 deaths. In 2025, two outbreaks involving 19 cases were investigated.

Japan

Japan maintains national surveillance for enterohaemorrhagic E. coli food poisoning and infection. MHLW records show 19 food-poisoning outbreaks with 265 patients in 2023, 16 outbreaks with 124 patients in 2024, and 10 outbreaks with 362 patients in 2025. These figures represent food-poisoning events specifically and should not be interpreted as total STEC infection incidence.

India

A 2023 outbreak in an army facility in West Sikkim involved 30 cases among 223 residents, an attack rate of 13.5%, with STEC identified during the investigation and no deaths. India also has documented outbreaks caused by other diarrhoeagenic E. coli pathotypes, including a 2026-published investigation of an acute gastroenteritis outbreak in Mizoram in which atypical EPEC was isolated from all 40 affected individuals and one implicated food specimen.