What makes E. coli O157:H7 so dangerous?

O157:H7 produces Shiga toxin, which damages blood vessel linings, especially in kidneys and brain. About 5-10% of infections lead to hemolytic uremic syndrome (HUS)—a form of kidney failure. HUS is most common in children under 5 and can cause permanent kidney damage, brain damage, or death. This is why prompt diagnosis and avoiding anti-diarrheal medications are critical.

What is hemolytic uremic syndrome (HUS)?

HUS is a life-threatening complication where Shiga toxin destroys red blood cells and blocks kidney filtration. Symptoms: decreased urination, blood in urine, pale skin, extreme fatigue, irritability, small unexplained bruises. HUS requires hospitalization with blood transfusions and dialysis. Most children recover, but 12% have permanent kidney damage and 3-5% die.

Should I take anti-diarrheal medicine for E. coli?

NO. Anti-diarrheal medications (Imodium) may increase risk of HUS by slowing gut motility and allowing more toxin absorption. Antibiotics are also controversial—some studies suggest they may increase HUS risk by causing bacteria to release more toxin when dying. Seek medical evaluation rather than self-treating with medications.

What foods cause E. coli O157:H7?

Ground beef is the most common source (bacteria from cow intestines mixed during grinding). Also: raw milk, unpasteurized juice, raw vegetables (lettuce, sprouts), contaminated water, person-to-person in daycare/nursing homes. Whole cuts of beef are safer (bacteria only on surface, killed by cooking). Ground beef must reach 160°F throughout.

When should I see a doctor for E. coli?

Seek immediate medical care for: bloody diarrhea, severe stomach cramps, diarrhea lasting >3 days, fever >101.5°F, vomiting preventing fluid retention, signs of dehydration, or decreased urination (especially in children). Early recognition of HUS can be lifesaving. Children, elderly, and immunocompromised should seek care sooner.

How long does E. coli illness last?

Symptoms typically appear 3-4 days after exposure (range 1-10 days). Illness lasts 5-10 days in uncomplicated cases. However, bacteria can be shed in stool for weeks after recovery, requiring good hygiene to prevent spread. HUS typically develops 5-10 days after diarrhea starts.

E. coli

1 Active Outbreak

E. coli (Escherichia coli) are bacteria found in intestines. While most strains are harmless, some cause severe food poisoning with bloody diarrhea. The most dangerous strain, E. coli O157:H7, produces toxins causing kidney failure, especially in children.

Countries Affected

192

Recent Cases (30d)

Active Outbreaks

15d ago

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What is E. coli?

Most E. coli strains are part of healthy gut flora. However, Shiga toxin-producing E. coli (STEC), particularly O157:H7, cause approximately 265,000 illnesses annually in the U.S. About 5-10% of diagnosed cases develop hemolytic uremic syndrome (HUS), a life-threatening kidney condition. Undercooked ground beef, contaminated produce, and unpasteurized dairy are common sources.

Symptoms

Severe stomach cramps
Diarrhea (often bloody)
Vomiting
Mild fever (usually <101°F)
Symptoms last 5-10 days
HUS warning signs: Decreased urination, extreme fatigue, pale skin, bruising

Transmission

Eating contaminated food (ground beef, raw produce, unpasteurized dairy); contaminated water; person-to-person (poor hygiene); contact with infected animals

Contagious Period: While bacteria present in stool (can persist weeks after recovery); requires good hygiene

Prevention

Cook ground beef to 160°F (use food thermometer)
Avoid raw milk, unpasteurized juice, and raw cookie dough
Wash hands thoroughly after bathroom, changing diapers, before preparing food
Wash fruits and vegetables under running water
Avoid cross-contamination (separate raw meat from produce)
Don't swallow water when swimming in lakes, pools, or water parks
Keep children with diarrhea out of swimming areas and daycare
Avoid preparing food for others when ill

Live E. coli Global Case Map

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Inquiry launched into drinking water quality in two northern Greece villages

Greece 2026-08-01

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Two urgent preliminary inquiries have been ordered into drinking water quality in northern Greece following reports of dangerous bacterial contamination and heavy metals in municipal supplies at two villages. The action targets two popular areas in Central Macedonia. In the Sithonia municipality of Halkidiki, recent sampling requested by concerned residents in Agios Nikolaos and Trani Ammouda revealed levels of enterococci and E. coli that exceeded legal safety limits. Investigators are reviewing reports from regional health supervisors and environmental monitoring agencies. Meanwhile, in Nymfopetra in the Volvi municipality, water drawn from local boreholes showed elevated concentrations of uranium and fluoride. Prosecutors are reviewing municipal water utility records and evaluating prog...
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Expert Resources & References

Trusted information from leading health organizations

CDC

Official guidance from the U.S. Centers for Disease Control and Prevention

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WHO

Global disease surveillance and guidelines from the World Health Organization

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Research

Latest peer-reviewed research and clinical studies

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Medically Reviewed Content

Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.

Last reviewed: 2026-08-17

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Common questions about E. coli answered by our epidemiology team

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