Bacterial gastroenteritis

Bacterial gastroenteritis occurs when there is a bacterial infection of your stomach or intestines.

Causes

Bacterial gastroenteritis can affect one person or a group of people who all ate the same food. It is commonly called food poisoning. It often occurs after eating at picnics, school cafeterias, large social gatherings, or restaurants.

Your food may get infected in many ways:

• Meat or poultry may come into contact with bacteria when the animal is processed.
• Water that is used during growing or shipping may contain animal or human waste.
• Improper food handling or preparation may occur in grocery stores, restaurants, or homes.

Food poisoning often occurs from eating or drinking:

• Food prepared by someone who did not wash their hands properly
• Food prepared using unclean cooking utensils, cutting boards, or other tools
• Dairy products or food containing mayonnaise (such as coleslaw or potato salad) that have been out of the refrigerator too long
• Frozen or refrigerated foods that are not stored at the proper temperature or are not reheated properly
• Raw shellfish such as oysters or clams
• Raw fruits or vegetables that have not been washed well
• Raw vegetable or fruit juices and dairy products (look for the word "pasteurized" to make sure the food is safe to eat or drink)
• 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

  Campylobacter jejuni

  Campylobacter infection occurs in the small intestine from bacteria called Campylobacter jejuni. It is a type of bacterial food poisoning.

  

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• E coli

  E coli

  E coli enteritis is swelling (inflammation) of the small intestine from Escherichia coli (E coli) bacteria. It is the most common cause of travelers...

  

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• Salmonella

  Salmonella

  Salmonella enterocolitis is a bacterial infection in the lining of the small intestine that is caused by Salmonella bacteria. It is a type of food p...

  

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• Shigella

  Shigella

  Shigellosis is a bacterial infection of the lining of the intestines. It is caused by a group of bacteria called Shigella.

  

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• Staphylococcus aureus
• Yersinia

Symptoms

Symptoms depend on the type of bacteria that caused the sickness. All types of food poisoning cause diarrhea. Other symptoms include:

• Abdominal cramps

  Abdominal cramps

  Abdominal pain is pain that you feel anywhere between your chest and groin. This is often referred to as the stomach region or belly.

  

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• Abdominal pain
• Bloody stools

  Bloody stools

  Black or tarry stools with a foul smell are a sign of a problem in the upper digestive tract. It most often indicates that there is bleeding in the ...

  

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• Loss of appetite

  Loss of appetite

  A decreased appetite is when your desire to eat is reduced. The medical term for a loss of appetite is anorexia.

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• Nausea and vomiting

  Nausea

  Nausea is feeling an urge to vomit. It is often called "being sick to your stomach. "Vomiting or throwing-up forces the contents of the stomach up t...

  

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• Fever

Exams and Tests

Your health care provider will examine you for signs of food poisoning. These may include pain in the stomach and signs your body does not have as much water and fluids as it should (dehydration).

Lab tests may be done on the food or a stool sample to find out what germ is causing your symptoms. However, these tests do not always show the cause of the diarrhea.

Tests may also be done to look for white blood cells in the stool. This is a sign of infection.

Treatment

You will most likely recover from the most common types of bacterial gastroenteritis in a couple of days. The goal is to make you feel better and avoid dehydration.

Drinking enough fluids and learning what to eat will help ease symptoms. You may need to:

• Manage the diarrhea

  Manage the diarrhea

  Diarrhea is the passage of loose or watery stool. For some, diarrhea is mild and will go away within a few days. For others, it may last longer. I...

  

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• Control nausea and vomiting

  Control nausea and vomiting

  Having nausea (being sick to your stomach) and vomiting (throwing up) can be very difficult to go through. Use the information below to help you mana...

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• Get plenty of rest

If you have diarrhea and are unable to drink or keep down fluids because of nausea or vomiting, you may need fluids through a vein (IV). Young children may be at extra risk of getting dehydrated.

If you take diuretics ("water pills"), or ACE inhibitors for high blood pressure, contact your provider. You may need to stop taking these medicines while you have diarrhea. Never stop or change your medicines without first checking with your provider.

Antibiotics are not given very often for most common types of bacterial gastroenteritis. If diarrhea is very severe or you have a weak immune system, antibiotics may be needed.

You can buy medicines at the drugstore that can help stop or slow diarrhea. Do not use these medicines without checking with your provider if you have:

• Bloody diarrhea
• Severe diarrhea
• Fever

Do not give these medicines to children.

Outlook (Prognosis)

Most people get better in a few days without treatment.

Certain rare types of E coli can cause:

• Severe anemia

  Anemia

  Anemia is a condition in which the body does not have enough healthy red blood cells. Red blood cells provide oxygen to body tissues. Different type...

  

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• Gastrointestinal bleeding
• Kidney failure

When to Contact a Medical Professional

Contact your provider if you have:

• Blood or pus in your stools, or your stool is black
• Diarrhea with a fever above 101°F (38.33°C) or 100.4°F (38°C) in children
• Recently traveled to a foreign country and developed diarrhea
• Stomach pain that does not go away after a bowel movement
• Symptoms of dehydration (thirst, dizziness, lightheadedness)

Also contact your provider if:

• The diarrhea gets worse or does not get better in 2 days for an infant or child, or 5 days for adults
• A child over 3 months old has been vomiting for more than 12 hours; in younger babies, call as soon as vomiting or diarrhea begins

Prevention

Take precautions to prevent food poisoning.