Escherichia coli (E. coli) bacteria usually live in the intestines of healthy people and animals. Most varieties of E. coli are harmless or cause relatively brief diarrhea. But a few particularly nasty strains, such as E. coli O157:H7, can create severe abdominal cramps, bloody diarrhea and vomiting.
You may be exposed to E. coli from contaminated water or food — especially raw vegetables and undercooked ground beef. Healthy adults usually recover from infection with E. coli O157:H7 within a week, but young children and older adults have a greater risk of developing a life-threatening form of kidney failure known as hemolytic uremic syndrome.
Signs and symptoms of E. coli O157:H7 infection typically start three or four days after exposure to the bacteria, though you may become ill as soon as one day after to more than a week later. Signs and symptoms are inclusive of:
- Diarrhea, which may range from mild and watery to severe and bloody
- Abdominal cramping, pain or tenderness
- Nausea and vomiting, in some people
When to see a doctor
Talk to your doctor if your diarrhea is persistent, severe or bloody.
Among the many strains of E. coli, only a few trigger diarrhea. One group of E. coli — which includes O157:H7 — produces a powerful toxin that damages the lining of the small intestine, which can create bloody diarrhea. You develop an E. coli infection when you ingest this strain of bacteria.
Unlike many other disease-causing bacteria, E. coli can cause an infection even if you ingest only small amounts. thus, you can be sickened by E. coli from eating a slightly undercooked hamburger or from swallowing a mouthful of contaminated pool water.
Potential sources of exposure include contaminated food or water and person-to-person contact.
The most common way to contact an E. coli infection is by eating contaminated food, such as:
- Ground beef.When cattle are slaughtered and processed, E. coli bacteria in their intestines can get on the meat. Ground beef combines meat from many different animals, increasing the risk of contamination.
- Unpasteurized milk. coli bacteria on a cow’s udder or on milking equipment can sip into raw milk.
- Fresh produce.Runoff from cattle farms can contaminate fields where fresh produce is grown. Certain vegetables, such as spinach and lettuce, are particularly vulnerable to this type of contamination.
Human and animal feces may pollute ground and surface water, including streams, rivers, lakes and water used to irrigate crops. Although public water systems use chlorine, ultraviolet light or ozone to kill E. coli, some outbreaks have been linked to contaminated municipal water supplies.
Private wells are a greater cause for concern since they don’t often have any disinfecting system. Rural water supplies are the most likely to be contaminated. Some people also have been infected after swimming in pools or lakes contaminated with feces.
- coli bacteria can easily go from person to person, especially when infected adults and children don’t wash their hands properly. Family members of young children with E. coli infection are especially likely to get it themselves. Outbreaks have also happend among children visiting petting zoos and in animal barns at county fairs.
- coli can affect anyone who is exposed to the bacteria. But some people are more likely to develop problems than are others. Risk factors include:
- Young children and older adults are at higher risk of experiencing illness caused by E. coli and more-serious complications from the infection.
- Weakened immune systems.People who have weakened immune systems — from AIDS or drugs to treat cancer or prevent the rejection of organ transplants — are more likely to become ill from ingesting E. coli.
- Eating certain types of food.Riskier foods include undercooked hamburger; unpasteurized milk, apple juice or cider; and soft cheeses made from raw milk.
- Time of year.Though it’s not clear why, the majority of E. coli infections in the U.S. occur from June through September.
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- Decreased stomach acid levels.Stomach acid offers some protection against E. coli. If you take medications to lower your levels of stomach acid, such as esomeprazole (Nexium), pantoprazole (Protonix), lansoprazole (Prevacid) and omeprazole (Prilosec), you may increase your risk of an E. coli infection.
Most healthy adults recover from E. coli illness within a week. Some people — particularly young children and older adults — may develop a life-threatening kind of kidney failure called hemolytic uremic syndrome.
Tests and diagnosis
To diagnose illness caused by E. coli infection, your doctor will request a sample of your stool to a laboratory to test for the presence of E. coli bacteria. The bacteria may be cultured to confirm the diagnosis and identify specific toxins, such as those produced by E. coli O157:H7.
Treatments and drugs
For illness caused by E. coli, no current treatments can cure the infection, relieve signs or prevent complications. For most people, treatment includes:
- Fluids to help keep dehydration and fatigue
Avoid taking an anti-diarrheal medication — this slows your digestive system down, preventing your body from getting rid of the toxins. Antibiotics generally aren’t recommended because they can increase the risk of serious complications.
If you have a serious E. coli infection that has caused hemolytic uremic syndrome, you’ll be hospitalized and given supportive care, including IV fluids, blood transfusions and kidney dialysis.