At healthy-life-experts, our team is committed to helping you understand common infections and protect your health. In this guide, we explain what Shigella infection is, its symptoms, causes, treatment options, and practical ways to prevent its spread so you can make informed decisions for yourself and your family.
Shigella infection, also called shigellosis, is a contagious intestinal illness caused by a group of bacteria called Shigella. It is one of the most common causes of bacterial diarrhea worldwide, and it spreads very easily. Most people recover within a week, but the illness can be severe in young children, older adults, and people with weakened immune systems. Knowing the signs and how to prevent spread can protect you and your family.
What Is Shigella Infection?
Shigella bacteria infect the lining of the large intestine, causing inflammation and damage. There are four main species: Shigella sonnei, S. flexneri, S. boydii, and S. dysenteriae. S. sonnei is the most common in higher-income countries, while S. flexneri is more common in developing regions.
Symptoms of Shigella Infection
Symptoms usually appear one to two days after exposure. Common signs include:
- Diarrhea, which may be watery or contain blood or mucus
- Fever
- Stomach cramps and abdominal pain
- Nausea or vomiting
- A painful, urgent need to pass stool even when little comes out (tenesmus)
Some people have mild symptoms or none at all, but they can still pass the bacteria to others. Illness typically lasts five to seven days.
How Does Shigella Spread?
Shigella spreads through the fecal-oral route. This means tiny amounts of stool from an infected person end up in someone else’s mouth. Only a very small number of bacteria, as few as ten, can cause illness, which is why outbreaks happen so easily.
Common ways it spreads:
- Poor handwashing after using the toilet or changing diapers
- Contaminated food, especially raw vegetables or food handled by an infected person
- Contaminated water, including drinking water, lakes, and swimming pools
- Close contact, including in daycare centers, households, and some sexual contact
- Travel to areas with limited sanitation
Young children are affected most often, partly because they put their hands in their mouths and may not wash well.
When to See a Doctor
Many cases improve on their own, but seek medical care if you or your child has:
- Bloody diarrhea
- A high fever
- Diarrhea lasting more than a few days
- Signs of dehydration, such as very dark urine, dry mouth, dizziness, or no tears when crying
- Severe abdominal pain or repeated vomiting
Infants, older adults, pregnant women, and people with weakened immunity should be evaluated early.
How Is Shigella Diagnosed?
A doctor will usually order a stool test to identify the bacteria. Because other infections cause similar symptoms, testing helps confirm the diagnosis and guides treatment.
Shigella Infection Treatment
The most important treatment is replacing lost fluids and electrolytes. Drink plenty of water, oral rehydration solutions, and clear broths. Rest, and return to normal foods gradually as your appetite improves.
Antibiotics. Mild cases often resolve without them. Doctors may prescribe antibiotics for severe illness, for people at higher risk, or to limit spread in some situations. Antibiotic resistance is a growing concern with Shigella, so these drugs should only be used under medical advice.
Avoid anti-diarrheal medicines. Products such as loperamide can slow the body’s clearance of the bacteria and may make the illness worse. Check with a doctor before using them.
Possible Complications
Most people recover fully, but complications can occur:
- Dehydration, the most common serious problem
- Reactive arthritis, a joint inflammation that can develop weeks later
- Seizures in young children with high fever
- Hemolytic uremic syndrome, a rare but serious kidney complication linked mainly to S. dysenteriae
- Bloodstream infection, rare and mostly in people with weak immune systems
How to Prevent Shigella Infection
Simple habits make a big difference:
- Wash your hands with soap and water for at least 20 seconds after using the toilet, changing diapers, and before eating or preparing food.
- Handle food safely. Wash produce, cook food thoroughly, and keep raw and cooked foods separate.
- Drink safe water, especially when traveling. Use bottled or properly treated water if unsure.
- Stay home while sick. Avoid work, school, or daycare until diarrhea has stopped, and avoid preparing food for others.
- Skip swimming for at least a week after diarrhea ends, as bacteria can linger.
- Clean contaminated surfaces such as toilets, diaper-changing areas, and counters with a disinfectant.
- Practice safer sex, including avoiding sexual contact while sick and for a period after recovery.
Medical disclaimer: This article is for general information only and is not a substitute for professional medical advice. If you suspect Shigella infection, contact a qualified healthcare provider.
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