Shigellosis

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

Causes

There are several types of Shigella bacteria, including:

• Shigella sonnei, also called "group D" Shigella, is responsible for most cases of shigellosis in the United States.
• Shigella flexneri, or "group B" Shigella, causes almost all other cases.
• Shigella dysenteriae, or "group A" Shigella is rare in the United States. However, it can lead to deadly outbreaks in developing countries.

People infected with the bacteria release it into their stool. They can spread the bacteria to water or food, or directly to another person. Getting just a little bit of the Shigella bacteria into your mouth is enough to cause infection.

Outbreaks of shigellosis are linked with poor sanitation, contaminated food and water, and crowded living conditions.

Shigellosis is common among travelers in developing countries and workers or residents in refugee camps.

In the United States, the condition is most commonly seen in daycare centers and places where groups of people live, such as nursing homes.

Symptoms

Symptoms often develop about 1 to 7 days (average 3 days) after coming into contact with the bacteria.

Symptoms include:

• Acute (sudden) abdominal pain or cramping

  Abdominal pain

  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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• Acute fever
• Blood, mucus, or pus in the stool

  Blood, mucus, or pus in the stool

  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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• Crampy rectal pain
• Nausea and vomiting
• Watery and bloody diarrhea

Exams and Tests

If you have symptoms of shigellosis, your health care provider will check for:

• Dehydration (not enough fluids in your body) with a fast heart rate and low blood pressure
• Abdominal tenderness
• Elevated level of white blood cells in the blood
• Stool culture to check for the presence of the bacteria

  Stool culture

  A fecal culture is a lab test to find organisms in the stool (feces) that can cause gastrointestinal symptoms and disease.

  

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Treatment

The goal of treatment is to replace fluids and electrolytes (salt and minerals) that are lost in diarrhea.

Medicines that stop diarrhea are generally not given because they can cause the infection to take longer to go away.

Self-care measures to avoid dehydration include drinking electrolyte solutions to replace the fluids lost by diarrhea. Several types of electrolyte solutions are available over-the-counter (without a prescription).

Dehydration

Dehydration occurs when your body does not have as much water and fluids as it needs. Dehydration can be mild, moderate, or severe, based on how much...

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Antibiotics can help shorten the length of the illness. These medicines also help prevent the illness from spreading to others in group living or daycare settings. They may also be prescribed for people with severe symptoms.

If you have diarrhea and cannot drink fluids by mouth because of severe nausea, you may need medical care and intravenous (IV) fluids. This is more common in small children who have shigellosis.

People who take diuretics ("water pills") may need to stop taking these medicines if they have acute Shigella enteritis. Never stop taking any medicine without first talking to your provider.

Acute

Acute means sudden. Acute symptoms appear, change, or worsen rapidly. It is the opposite of chronic.

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Outlook (Prognosis)

The infection can be mild and goes away on its own. Most people, except malnourished children and those with weakened immune systems, typically recover fully.

Possible Complications

Complications may include:

• Dehydration, severe
• Hemolytic-uremic syndrome (HUS), a form of kidney failure with anemia and clotting problems

  Hemolytic-uremic syndrome

  Shiga-like toxin producing E coli hemolytic-uremic syndrome (STEC-HUS) is a disorder that most often occurs when an infection in the digestive system...

  

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• Reactive arthritis

  Reactive arthritis

  Reactive arthritis is a type of arthritis that follows an infection. It may also cause inflammation of the eyes, skin and urinary and genital system...

  

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About 1 in 10 children (under age 15) with severe Shigella enteritis develop nervous system problems. These may include febrile seizures (also called a "fever fit") when body temperature rises quickly and the child has seizures. A brain disease (encephalopathy) with headache, lethargy, confusion, and stiff neck can also develop.

Febrile seizures

A febrile seizure is a convulsion in a child triggered by a fever.

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Confusion

Confusion is the inability to think as clearly or quickly as you normally do. You may feel disoriented and have difficulty paying attention, remembe...

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When to Contact a Medical Professional

Contact your provider if diarrhea does not improve, if there is blood in the stool, or if there are signs of dehydration.

Go to the emergency room if these symptoms occur in a person with shigellosis:

• Confusion
• Headache with stiff neck
• Lethargy
• Seizures

These symptoms are most common in children.

Prevention

Prevention includes properly handling, storing, and preparing food, and good personal hygiene. Handwashing is the most effective way to prevent shigellosis. Avoid food and water that may be contaminated.

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