E. coli enteritis


enteritis is swelling (inflammation) of the small intestine from () bacteria. It is the most common cause of travelers' diarrhea.

Alternative Names

Traveler's diarrhea - E. coli; Food poisoning - E. coli; E. coli diarrhea; Hamburger disease

Causes, incidence, and risk factors

is a type of bacteria that lives in the intestines of humans and animals without causing any problems most of the time. However, certain types (or strains) of can cause food poisoning. One strain ( O157:H7) can cause a severe case of food poisoning.

Bacteria may get into your food in different ways:

  • Meat or poultry may come into contact with normal bacteria from the intestines of an animal while it is being processed
  • Water used during growing or shipping may contain animal or human waste
  • Food may be handled in an unsafe way during transport or storage
  • Unsafe food handling or preparation in grocery stores, restaurants, or homes

Food poisoning can occur after eating or drinking:

  • Any food prepared by someone who did not wash their hands well
  • Any food prepared using unclean cooking utensils, cutting boards, or other tools
  • Dairy products or food containing mayonnaise (such as coleslaw or potato salad) which have been out of the refrigerator too long
  • Frozen or refrigerated foods that are not stored at the proper temperature or are not properly reheated
  • Fish or oysters
  • Raw fruits or vegetables that have not been washed well
  • Raw vegetable or fruit juices and dairy products
  • Undercooked meats or eggs
  • Water from a well or stream, or city or town water that has not been treated

Although not common, can be spread from one person to another. This may happen when someone does not wash his or her hands after a bowel movement and then touches other objects or someone else's hands.


Symptoms occur when bacteria enter the intestine. The time between being infected and developing symptoms is usually 24 to 72 hours. The most common symptom is sudden, severe diarrhea that is often bloody.

Other symptoms may include:

  • Fever
  • Gas
  • Loss of appetite
  • Stomach cramping
  • Vomiting (rare)

Symptoms of a rare but severe infection include:

  • Bruises that happen easily
  • Pale skin
  • Red or bloody urine
  • Reduced amount of urine

Signs and tests

Your health care provider will perform a physical exam. A stool culture can be done to check for disease-causing .


Most of the time, you will recover from the most common types of infection within a couple of days. The goal of treatment is to make you feel better and avoid dehydration. Getting enough fluids and learning what to eat will help keep you or your child comfortable.

You may need to:

You can drink oral rehydration mixtures to replace fluids and minerals lost through vomiting and diarrhea. Oral rehydration powder can be purchased from a pharmacy. Be sure to mix the powder in safe water.

You can make your own mixture by dissolving ½ teaspoonful each salt and baking soda and 4 tablespoonsful sugar in 4 ¼ cups (1 liter) water.

If you have diarrhea or vomiting and cannot drink or keep enough fluids in your body, you may need fluids given through a vein (IV).You will need to go to your health care provider's office or the emergency room.

If you take diuretics (water pills), talk to your health care provider. You may need to stop taking the diuretic while you have diarrhea. Never stop or change medications without first talking to your health care provider. You can buy medicines at the drugstore that can help stop or slow diarrhea. Do not use these medicines without talking to your health care provider if you have bloody diarrhea or a fever. Do not give these medicines to children.

Support Groups

Expectations (prognosis)

You usually get better in a few days, without treatment. Some uncommon types of anemia can cause severe or even kidney failure.

Calling your health care provider

Call for an appointment with your health care provider if:

  • You are unable to keep down fluids
  • Your diarrhea does not get better in 5 days (2 days for an infant or child), or it gets worse
  • Your child has been vomiting for more than 12 hours (in a newborn under 3 months, call as soon as vomiting or diarrhea begins)
  • You have abdominal pain that does not go away after a bowel movement
  • You have a fever above 101°F, or your child has a fever above 100.4°F along with the diarrhea
  • You have recently traveled to a foreign country and developed diarrhea
  • You see blood or pus in your stool
  • You develop symptoms of dehydration, such as not peeing or dry diapers, thirst, dizziness, or light-headedness
  • You develop new symptoms



Schiller LR, Sellin JH. Diarrhea. In: Feldman M, Friedman LS, Brandt LJ, eds. 9th ed. Philadelphia, Pa: Saunders Elsevier; 2010:chap 15.

Sodha SV, Griffin PM, Hughes JM. Foodborne disease. In: Mandell GL, Bennett JE, Dolin R, esd. . 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone. 2009;chap 99.

Craig SA, Zich DK. Gastroenteritis. In: Marx JA, ed. . 7th ed. Philadelphia, Pa: Mosby Elsevier; 2009:chap 92.

Encyclopedia content is provided as information only and not intended to replace the advice and instruction from your personal physician.