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Bacterial gastroenteritis is inflammation of the stomach and intestines caused by bacteria.

Infectious diarrhea - bacterial gastroenteritis; Acute gastroenteritis; Gastroenteritis - bacterial

Bacterial gastroenteritis can affect one person or a group of people who all ate the same contaminated food. It more commonly occurs after eating at picnics, school cafeterias, large social functions, or restaurants.

The germs may get into the food you eat (called contamination) in different ways:

• Meat or poultry may come into contact with the normal bacteria from the intestines of an animal being processed.
• Water that is used during growing or shipping may contain manure or human waste.
• Food handling or preparation in grocery stores, restaurants, or homes.

Food poisoning often occurs from eating or drinking:

• Any food prepared by someone who does not use proper hand washing techniques
• Any food prepared using cooking utensils, cutting boards, or other tools that are not fully cleaned
• Dairy products or food containing mayonnaise (such as coleslaw or potato salad) that have sat out of the refrigerator too long
• Frozen or refrigerated foods that are not stored at the proper temperature or are not reheated properly
• Raw fish or oysters
• Raw fruits or vegetables that have not been washed well
• Raw vegetable or fruit juices and dairy (look for the word "pasteurized")
• Undercooked meats or eggs
• Water from a well or stream, or city or town water that has not been treated

Many different types of bacteria can cause bacterial gastroenteritis, including:

• Campylobacter jejuni (see: Campylobacter enteritis)
• Clostridium
• E. coli (see: E. coli enteritis)
• Salmonella (see: Salmonella enteritis)
• Shigella (see: Shigella enteritis)
• Staphylococcus
• Yersinia

Each organism causes slightly different symptoms but all result in diarrhea. Other symptoms include:

• Abdominal cramps
• Abdominal pain
• Bloody stools
• Loss of appetite
• Nausea and vomiting

• Examination of food for bacteria
• Stool culture positive for the bacteria that causes the infection
• White blood cells in the stool

This disease may also alter the results of the following tests:

• Fecal smear
• Stool gram stain

In most cases, symptoms improve with fluid and electrolyte replacement within a week. Rare cases of kidney failure or death related to bacterial gastroenteritis have been reported.

There have been increasing incidents of local outbreaks of severe infection with certain strains of E. coli bacteria. These outbreaks can be dangerous, especially to the elderly or very young children.

• Dehydration
• Kidney failure (rare)
• Low blood counts (anemia)
• Systemic (body-wide) infection

Call for an appointment with your health care provider if:

• You have blood or pus in your stools, or your stool is black
• You have abdominal pain that does not go away after a bowel movement
• You have symptoms of dehydration (thirst, dizziness, light-headedness)
• You have a fever above 101°F, or your child has a fever above 100.4°F, along with diarrhea
• You have recently traveled to a foreign country and developed diarrhea
• Your diarrhea does not get better in 5 days (2 days for an infant or child), or gets worse
• Your child has been vomiting for more than 12 hours (in a newborn under 3 months you should call as soon as vomiting or diarrhea begins)

Proper handling, storage, and preparation of food -- in addition to good sanitation -- are principles of prevention.

See also: Preventing food poisoning

Sodha SV, Griffin PM, Hughes JM. Foodborne disease. In: Mandell GL, Bennett JE, Dolin R, eds. Principles and Practice of Infectious Diseases. 7th ed. Philadelphia, Pa: Elsevier Churchill Livingstone; 2009:chap 99.

Craig SA, Zich DK. Gastroenteritis. In: Marx JA, ed. Rosen's Emergency Medicine: Concepts and Clinical Practice. 7th ed. Philadelphia, Pa: Mosby Elsevier;2009:chap 92.