Shigella Infection (Shigellosis): Symptoms & Treatment

Shigellosis, caused by the Shigella bacteria, is a highly infectious disease that primarily affects the digestive system. While it is more prevalent in developing countries with limited access to clean water and sanitation, cases are still reported globally, including among travellers and in communities with poor hygiene practices.

This blog aims to explain everything you need to know about Shigella infection – its symptoms, modes of transmission, available treatments, and preventive measures.

What is Shigella Infection (Shigellosis)?

Shigellosis is an intestinal disease caused by a group of bacteria known as Shigella. These bacteria are responsible for an acute form of diarrhoea, often referred to as bacillary dysentery, which can range from mild to severe.

The infection spreads easily, usually through the faecal-oral route, meaning it is often contracted by consuming contaminated food or water, or through direct contact with an infected person. Even a small number of bacteria can cause illness, making Shigella one of the most contagious bacterial diarrhoeal diseases.

There are four species of Shigella bacteria, but the most common in developing countries is Shigella flexneri, while Shigella sonnei is more prevalent in industrialised nations.

Shigellosis Symptoms: What to Watch For

Shigella symptoms typically appear within 1 to 3 days of exposure and can vary in intensity depending on the individual’s age, overall health, and the strain of bacteria involved.

Common Shigellosis Symptoms Include:

• Diarrhoea, often bloody or with mucus
• Abdominal cramps and pain
• Fever
• Nausea and vomiting
• Urgency to defecate, even when the bowels are empty
• Fatigue and dehydration, particularly in children and the elderly

These Shigellosis symptoms generally last 5 to 7 days, although the infection can persist longer if not treated properly. In severe cases, it can lead to complications such as:

• Severe dehydration
• Seizures (especially in young children)
• Rectal prolapse
• Hemolytic uremic syndrome (HUS) – a rare but serious condition affecting the kidneys

If you or a loved one are experiencing symptoms of Shigella infection, particularly bloody diarrhoea or high fever, it’s crucial to seek medical attention immediately.

How is Shigella Transmitted?

Shigella spreads through:

• Contaminated food or water
• Person-to-person contact, especially in childcare settings
• Improper handwashing after using the toilet or changing nappies
• Sexual contact involving oral-anal contact

Because it takes only a small number of bacteria to cause illness, outbreaks can spread quickly in communities, schools, and care facilities.

Diagnosing Shigellosis

Doctors typically diagnose Shigellosis by analysing a stool sample. The test helps to:

• Confirm the presence of Shigella bacteria
• Determine antibiotic resistance
• Rule out other causes of diarrhoea (such as Salmonella or E. coli)

Prompt diagnosis is essential for effective treatment and to prevent further spread of the infection.

Shigella Treatment Options

While Shigella infection often resolves on its own, treatment can reduce the severity and duration of symptoms, especially in vulnerable individuals such as children, the elderly, and people with weakened immune systems.

1. Hydration and Supportive Care

The most important treatment is rehydration:

• Oral Rehydration Salts (ORS) to replace lost fluids and electrolytes
• IV fluids in severe cases of dehydration
• Rest and proper nutrition

2. Antibiotics

Antibiotics may be prescribed in moderate to severe cases. However, due to increasing antibiotic resistance, not all strains of Shigella respond to standard medications.

Effective antibiotics include:

• Ciprofloxacin
• Azithromycin
• Ceftriaxone (in severe hospitalised cases)

Doctors will typically base the antibiotic choice on local resistance patterns and laboratory test results.

Important: Antibiotics should only be taken under medical supervision. Overuse or misuse can worsen resistance problems.

3. Avoiding Anti-diarrhoeal Medicines

Over-the-counter medications like loperamide (Imodium) should be avoided, as they can prolong the illness and increase the risk of complications.

Preventing Shigella Infection

Because Shigellosis is so easily transmitted, prevention is the key to controlling its spread. Here are some effective prevention strategies:

• Wash hands thoroughly with soap and water after using the toilet or changing nappies
• Ensure food is properly cooked and served hot
• Drink only safe, treated, or boiled water
• Avoid raw produce in areas with poor sanitation
• Practise safe sex, particularly avoiding oral-anal contact

In childcare settings and schools, infected children should stay home for at least 24 hours after symptoms stop, or longer if advised by health professionals.

Shigella and Travellers

Travellers to developing countries are at increased risk of Shigella infection, especially when consuming street food, untreated water, or undercooked meals.

To minimise your risk while travelling:

• Drink bottled or boiled water
• Avoid ice cubes in drinks
• Eat food that is hot and freshly cooked
• Carry oral rehydration salts and travel-safe medications
• Maintain proper hand hygiene

Need for Health Insurance

Although Shigellosis is often self-limiting, complications can require hospitalisation, lab tests, and long-term care. For NRIs or USA expatriates travelling to or living in India, ensuring access to quality healthcare is essential.

Niva Bupa NRI Health Insurance Plans

Niva Bupa offers tailored indian health insurance designed specifically for Non-Resident Indians (NRIs). These plans can help cover:

• Hospitalisation for infectious diseases like Shigella infection
• Outpatient consultations, including lab tests and medications
• Cashless treatments at network hospitals
• 24/7 support, ideal for emergency care while travelling
• Pre- and post-hospitalisation expenses

Whether it’s a short trip or a long-term stay in India, having Niva Bupa NRI health insurance gives you peace of mind knowing you're protected from unexpected medical costs.

Wrapping Up

Shigellosis remains a significant public health concern due to its ease of transmission and growing antibiotic resistance. However, with proper hygiene, awareness of Shigella symptoms, and access to timely treatment, the infection can be effectively managed and prevented.

Travellers, especially NRIs, should take extra precautions and ensure they have the necessary health cover to manage sudden illnesses. Choosing a trusted provider like Niva Bupa for your health insurance needs ensures that you're prepared for both the expected and unexpected.

FAQs

1. What is Shigellosis, and how do you get it?

Shigellosis is a bacterial infection caused by Shigella that leads to diarrhoea, often with blood or mucus. It spreads primarily through the faecal-oral route, meaning you can get it by consuming contaminated food or water, or through direct contact with an infected person.

2. What are the first signs of Shigella infection?

The first symptoms of Shigella infection usually appear 1 to 3 days after exposure and may include sudden diarrhoea, abdominal cramps, fever, and a frequent urge to defecate. In some cases, the diarrhoea may be bloody or accompanied by mucus.

3. Is Shigella infection serious?

While most cases of shigellosis are mild and resolve on their own, severe infections can lead to dehydration, kidney complications, or even seizures in children. It can be serious in young children, the elderly, and people with weakened immune systems.

4. How is Shigellosis treated?

Shigella treatment includes staying well-hydrated with oral rehydration salts (ORS) and, in some cases, antibiotics if the infection is moderate or severe. Antibiotics help shorten the illness and reduce the spread, but should only be used under medical guidance.