What is Shigella? Symptoms, Transmission, Prevention & Treatment Explained

Introduction

Have you or someone in your household suddenly started having severe abdominal cramps, fever, and loose motions? If blood or phlegm is also coming in the gums then the matter may be a little more than the normal stomach disorder. One of the main reasons is a virus. It’s called Shigella.

Many people hear Shigella’s name for the first time. When the doctor holds the report of their stool test in his hand and says that the infection is of Shigella. Many questions come to mind: What is it? How did we feel? Could it be the same for others? What’s the treatment? Antibiotics are needed all the time?

In this article, we will answer these questions in simple language. We will see what is Shigella, how Shigella infection occurs, what are its symptoms, how it spreads, how treatment is carried out, why drug-resistant Shigella is causing concern, and most importantly, how prevention is possible.

This information is for general information. If you or your child is sick, see a doctor.

Table of Contents

• Introduction
• What is Shigella?
• Types of Shigella Bacteria
• What is Shigella Infection (Shigellosis)?
• Shigella Symptoms
• Symptoms for Shigella: Children vs Adults
• How is Shigella Transmitted?
• How Do You Get Shigella? Common Sources
• Who Is at Higher Risk?
• Complications of Shigella Infection
• How is Shigella Diagnosed?
• Shigella Treatment
• Drug Resistant Shigella
• How Can People Prevent Shigella?
• Food and Water Safety Tips
• When to See a Doctor
• Shigella vs Other Causes of Diarrhea
• Frequently Asked Questions (FAQs)
• Conclusion

What is Shigella?

Shigella is a type of bacteria that affects the human gut. This bacterium is very small, but its speciality is that it enters the inner layer of the intestine and causes inflammation and wounds there. That is why the patient has abdominal pain, fever and bloody or bulgy diarrhoea.

This disease is known as Shigellosis. In common language people also call it ‘blood dysentery’ or ‘bacterial diarrhoea’. In ancient medical books, the name “bacillary dysentery” is also found, which was actually used for dysentery caused by shigella itself.

The most dangerous feature of this microbe is that it requires a very small number to make it sick. According to experts, only 10 to 100 germs can make a healthy person sick. This means that even the slightest contamination on the hand can cause an infection if it reaches the mouth. That’s why Shigella spreads so quickly in homes, schools, daycare centers, and densely populated areas.

There are millions of cases of shigella around the world every year, and those areas are the most affected. Where the system of clean water, sanitation and drainage is weak. Children under the age of five are most at risk.۔

Types of Shigella Bacteria

There are four main types of shigella. The intensity of each type and the way it is found in different parts of the world is different. A brief comparison is given in the table below.۔

Species	Also Known As	Typical Severity	Where It Is Commonly Seen
Shigella dysenteriae	Group A	Often the most severe; can cause outbreaks and serious complications	Low-income regions with poor sanitation
Shigella flexneri	Group B	Moderate to severe; common in developing countries	South Asia, Africa and other developing regions
Shigella boydii	Group C	Usually moderate; less common	Mainly the Indian subcontinent
Shigella sonnei	Group D	Usually milder; most common in high-income countries	North America, Europe and developed regions

Shigella flexneri is more commonly seen in Pakistan and other countries in South Asia, while cases of Shigella sonnei are more common in developed countries. A special type of Shigella dysenteriae (type 1) produces a toxic substance Which is called Shiga toxin, and it can cause complications such as kidney problems.

What is Shigella Infection (Shigellosis)?

When shigella bacteria enter the body through the mouth and reach the large intestine and cause disease there, it is called shigella infection or shigellosis. These bacteria escape from the stomach acid to a great extent, so they reach the intestine in very small numbers.

On reaching the intestine these germs enter the cells of the wall of the intestine and start growing there. The body’s immune system responds against this attack, causing inflammation and small lesions in the intestine. These injuries cause blood and mucus in the gums.

In most healthy adults, the infection resolves on its own in five to seven days. But it can take a serious form in young children, the elderly and people with weakened immunity. Another important thing is that even after recovery, germs can continue to be released in the stool for a few days or weeks, that is, the patient can infect others even after recovery.۔

Shigella Symptoms

Shigella symptoms usually appear one to two days after the virus enters the body, although sometimes it can take up to a week.The severity of symptoms may vary for each person. Some people have mild pain and some have severe pain.

The most common shigella symptoms are:

• Diarrhoea: Diarrhoea that may later become bloody or phlegmatic. The number of hands is often several times a day.
• Abdominal cramps and pain: The pain often comes in the form of waves and the patient feels nausea frequently.
• Fever: From a mild to a high fever, sometimes accompanied by chills.
• Tenesmus is a strange sensation in which the patient feels that the stool is not yet completely eliminated, although the intestine is almost empty.
• Nausea and vomiting: Some patients, especially children, may also have these symptoms.
• Lack of appetite and weakness: The body becomes tired due to constant knocks.
• Symptoms of dehydration: dry mouth, decreased urination, dizziness, and blurred vision.

In some people, the infection may occur without any obvious symptoms. Such people themselves do not know that there are germs inside them, but they can spread the infection to others.

Symptoms usually last for five to seven days. If there is no improvement in a few days, there is too much blood in the hands, or there are signs of dehydration, you should immediately consult a doctor.

Symptoms for Shigella: Children vs Adults

Many parents ask whether the symptoms for shigella in children are different from those in adults. The basic symptoms are similar, but in children The risk is higher Because their body stores less water and they quickly become dehydrated.۔

Feature	In Children	In Adults
Fever	Often high; may trigger febrile seizures in young children	Usually mild to moderate
Dehydration risk	High and can develop quickly	Lower, but still possible
Bloody stool	Common	Common
Irritability and poor feeding	Frequently seen in infants and toddlers	Not applicable
Recovery time	About 5 to 7 days, sometimes longer	About 5 to 7 days
Need for hospital care	More likely in infants and malnourished children	Less likely unless severe

Young children may have seizures with high fever. If a child has a seizure, is too slow or semi-conscious, or continues to vomit, take him to the hospital without delay.۔

How is Shigella Transmitted?

It is very important to understand how shigella is transmitted, because prevention depends on it. The main route of transmission of Shigella is’ fecal-oral route ‘. In simple words, it means that the germs in the stool of a sick person somehow reach the mouth of another person.

This may sound strange, but it is actually very simple. For example:

• The sick person does not wash his hands properly after using the toilet, and then touches food or touches anything.
• The other person touches the same thing and takes his hand to his mouth.
• In this way only a few germs enter his body and the disease starts.
• The main ways in which shigella spreads are:
• Direct contact: with the hands, clothes, bedding or personal items of the sick person.

Contaminated food: food that has been prepared by a person with sick or unclean hands.

• Contaminated water: Drinking water, or swimming and bathing water that contains contaminants.
• Contaminated surfaces: Door handles, faucets, toys, diaper changing places and toilet surfaces.
• Sexual contact: In some cases, the infection can also be spread through oral and anal contact.

The important thing is that shigella does not spread through the air. It is not transmitted by coughing or sneezing. It is directly related to hygiene and hand hygiene.۔

How Do You Get Shigella? Common Sources

Now the question is how do you get shigella in real life? That is, every day a person becomes a victim of this infection. Let’s look at some common ones.

• The presence of a sick person in the house: If someone in the house gets shigella and care is not taken, other people can also get sick in a few days. The risk is particularly high to the mother or caregiver, as she changes and cleans the baby’s diapers.
• Daycare and school: Young children repeatedly put their hands in their mouths and share toys. That’s why outbreaks of shigella are common in schools and daycare centers.
• Roadside or unsafe food: Where the hands of food producers are not clean, or raw vegetables and salads have been washed with dirty water, there is an increased risk of infection. Salads, cut fruits and cold foods are considered especially dangerous.
• Unsafe drinking water: In areas where drinking water mixes with gutter water, Shigella spreads very quickly. Such incidents increase during the rainy and flood seasons.
• Travel: Traveling to countries or regions where the quality of sanitation is low can cause stomach ailments in travelers.
• Pool and water sports: If the water of the pool or lake is contaminated and someone swallows it by mistake, it can also be infected.
• Flies: Flies sit on dirt and then sit on food and transmit germs. That is why it is important to keep open food covered.

Who Is at Higher Risk?

Although shigella can happen to anyone, some groups are at higher risk than others:

• Children 2-5 years old are the most affected. Because children put their hands in their mouths and cleaning habits are not yet mature.
• Daycare and school going children and their families.
• people who take care of children.
• People with weakened immune systems: for example, people with HIV, people undergoing cancer treatment, or people taking immunosuppressive drugs.
• malnourished children.
• Inhabitants of densely populated and poorly cleaned areas.
• Travelers and tourists.
• Men who have sex with men: More cases of shigella have been reported in this group.

Complications of Shigella Infection

Most people recover from shigella without major complications, but problems can occur in some cases. It is important to know about them in advance so that they can be prevented with timely treatment.

Dehydration is the most common and most dangerous complication, especially in children and the elderly. With continuous loose motions and fever the water and salts of the body reduce rapidly. If water and ORS are not given on time, the patient may need to be put on drip.

Seizures may be caused by high fever in young children. Sometimes shigella has also been seen to have neurological effects in children.

Reactive arthritis (inflammation of the joints): In some people, symptoms such as joint pain, eye irritation, and urinary incontinence may appear after the infection is cured. This condition is usually seen more after Shigella flexneri and can last for months.

Hemolytic Uremic Syndrome (HUS) is a rare but serious complication that is mostly associated with Shigella dysenteriae type 1. In this, the red blood cells begin to break down and the kidneys can be affected. In this case, immediate medical attention is required.

Toxic Megacolon and intestinal problems: In severe cases, the large intestine may become inflamed or perforated. It is rare, but can be deadly.

Bloodstream infection: In patients with very weak immunity, the bacterium can get into the blood, which is considered a serious situation.

Malnutrition can affect the development of children who have frequent shigella. The body is not able to absorb all the nutrients from the food.

How is Shigella Diagnosed?

Shigella is not completely diagnosed by looking at the symptoms alone, as many other microbes produce similar symptoms. Doctors usually use the following methods:

• Stool culture – A sample of the patient’s stool is sent to the laboratory. Where microbes are grown and identified. It is considered to be the most reliable test.
• Stool PCR / Molecular Tests: Advanced tests that capture the genetic material of the microbes and give quick results.
• Antibiotic Sensitivity Test: Along with culture, it is also seen which antibiotic affects the microbes. This is especially important because many bacteria today have developed resistance to common drugs.
• Blood tests: In severe cases, blood tests check for dehydration, kidney function, and the severity of the infection.

If you have taken the medicine on your own during diarrhea, be sure to tell the doctor, as this may affect the test result.

Shigella Treatment

The main purpose of treatment is two things: not to allow dehydration in the body, and to eliminate microbes if necessary. In mild cases, only rest and adequate fluids are often sufficient.

1:Fluids and Oral Rehydration

The first and most important step is to avoid dehydration. Drink Oral Rehydration Solution (ORS) regularly. Clean boiled water, rice water, lentil water, coconut water and mild broths can also be useful. Feed the children frequently with small spoons. If the child vomits, stop for a few minutes and start again slowly.

2:Rest and Light Diet

Allow the patient to rest. When hungry, give light foods, such as bananas, rice, yogurt, boiled potatoes and khichdi. It is better to avoid oily, spicy and junk food. Don’t stop breast milk or formula.

3:Antibiotics

Antibiotics are not necessary for every shigella infection, as mild cases tend to resolve on their own. However, doctors may prescribe antibiotics if there are severe symptoms, weak immunity, or if there is a need to prevent the infection from spreading to others. Commonly used drugs include Azithromycin, Ciprofloxacin and Ceftriaxone, but the right choice is made by the doctor by looking at the test report, the age of the patient and the local resistance situation. Never start an antibiotic on your own, and complete the course if prescribed by a doctor.

4:Medicines to be avoided

Anti-diarrheal medications, such as Loperamide, are not generally considered appropriate in Shigella. These can cause the bacteria to stay longer in the intestine and increase the risk of complications. Similarly, do not give any medicine for pain or fever to children without the advice of a doctor.

5:The hospital’s care

Hospitalization and drip may be necessary in cases of severe dehydration, persistent vomiting, fainting, seizures, or very bloody diarrhea.

Drug Resistant Shigella

In the last few years, drug resistant shigella has become a major concern for doctors and health experts around the world. In simple terms, this means that some of the Shigella microbes have become such that the commonly used antibiotics do not affect them.

What is Antibiotic Resistance.

When antibiotics are used excessively or incorrectly, e.g., unnecessarily, by taking an incomplete course, or without a doctor’s advice, microbes adapt to these drugs over time. Then the medicine does not work on them and the disease becomes difficult to treat.

XDR Shigella

XDR stands for Extensively Drug-Resistant. Such bacteria are resistant to many important antibiotics. Many international organizations, including the U.S. CDC, have pointed out that such cases have increased in recent years. Treatment of such infections is limited to medications, and sometimes the patient has to be hospitalized and given medication by injection.۔

Why is there a growing resistance?

• Easy availability of antibiotics without a prescription.
• Start self-medication in mild diarrhoea or fever.
• leave the course.
• Spread of resistant microbes through travel from one country to another.
• Increased use of antibiotics in animal feed and agriculture.
• Poor sanitation systems that allow resistant microbes to spread rapidly.

What can we do to

The most effective measures for the common man are: take antibiotics only on the advice of a doctor, complete the entire course, do not give the leftover medicines to others,

How Can People Prevent Shigella?

Many people think that there will be a certain way how people can prevent shigella, but in fact the methods of prevention are simple and connected with everyday habits. No commonly available shigella vaccine is yet in routine use, so hygiene is the strongest weapon.

1. Handwashing

This is the most important and effective step. Wash your hands with soap and water for at least 20 seconds. In particular, on these occasions:

• after using the toilet.
• After changing or cleaning the baby’s diaper.
• Before cooking, serving, or eating.
• after taking care of a sick person.
• after touching or coming in contact with animals.

If soap and water are not available, a hand sanitizer with at least 60% alcohol can be used, but it is not a complete substitute for soap and water.

2. Safe Handling of a Sick Person

If there is a patient of shigella at home, take special care of a few things:

• Use separate towels, utensils and glasses for the patient.
• Toilet surfaces, faucets and handles should be cleaned daily with disinfectant solution.
• Wash the patient’s contaminated clothes and bedding separately with warm water and detergent.
• Waste the baby’s diaper in a closed bag and wash your hands immediately.
• Prevent the patient from cooking or serving food to others.

3. Stay Home When Sick

Do not send children to school or daycare during diarrhea and fever, and adults should also be fully recovered before going to work. Especially those who are associated with the food preparation, hotel, restaurant or child care sector, they should not return to work without the permission of the doctor. Remember, even after the diarrhea stops, the microbes can be released for a few days.

4. Safe Intimate Practices

Take care of cleanliness before and after sex. If you or your partner is suffering from diarrhoea, it is best to avoid sexual contact for at least a few weeks after recovery.

Food and Water Safety Tips

Since Shigella is also spread through food and water, daily dietary precautions are very important.

• Water: Drinking water should be boiled or filtered. Where water quality is in doubt, prefer bottled water.
• Raw Vegetables and Fruits: Wash them well in running water. the ones that bear fruit Strain them before eating.
• Cooked food: Cook food well and eat hot food only. Do not keep cooked food at room temperature for more than two hours.
• Cover food: Protect against flies and insects.
• Separate Raw and Cooked: Use a separate knife and cutting board for raw and cooked food.
• Eating out: Beware of roadside items that are left open, such as cut fruits, salads, and iced drinks.
• Swimming: Avoid water entering the mouth when bathing in a pool or lake, and do not swim during illness.
• Travel: When travelling to such areas, use only bottled water, hot cooked food and self-peeling fruits.

When to See a Doctor

Most cases can be managed at home, but there are some symptoms in which a delay can be dangerous. Contact your doctor or hospital immediately in the following cases:

• There is a lot of blood or mucus in the hands.
• Fever above 102 degrees Fahrenheit (about 39 degrees Celsius) or does not subside for several days.
• Do not stop after 5-7 days.
• Symptoms of dehydration are: excessive thirst, dry mouth, very little or dark color of urine, dizziness, crying of the child without tears.
• Because of continuous vomiting water also does not remain stagnant.
• The child has a seizure, is too slow or faint.
• The patient may be an infant, elderly, pregnant woman or with weak immunity.
• Severe abdominal pain that continues to increase.
• Pain in the joints or swelling of the eyes after infection.

Shigella vs Other Causes of Diarrhea

There are many other causes of diarrhea, so it can be difficult to judge just by looking at the symptoms. The comparison below will help you understand the main difference.

Condition	Common Cause	Typical Signs	Blood in Stool?
Shigellosis	Shigella bacteria	Fever, cramps, frequent small stools, tenesmus	Often yes
Viral gastroenteritis	Norovirus, Rotavirus	Watery diarrhea, vomiting, mild fever	Rarely
Salmonella infection	Salmonella bacteria	Diarrhea, fever, cramps, often linked to eggs or poultry	Sometimes
Amoebic dysentery	Entamoeba histolytica	Gradual onset, abdominal pain, bloody mucus	Often yes
Cholera	Vibrio cholerae	Very watery “rice water” diarrhea, rapid dehydration	No
Food poisoning (toxin type)	Preformed bacterial toxins	Sudden vomiting and diarrhea within hours	Rarely

Remember, only the test can tell for sure what the exact cause of the disease is.

Frequently Asked Questions (FAQs)

What is Shigella?

Shigella is a bacteria that causes intestinal infections and causes diarrhea, fever, and abdominal pain. The disease is called shigellosis.

What is Shigella infection?

This condition is called shigella infection. When this bacterium enters the body and affects the walls of the intestine. It is often accompanied by bloody or bulging diarrhea, fever, and malaise.

How long does Shigella last?

Symptoms usually go away in five to seven days. In some cases, it may take longer, and the microbes may be excreted in the stool for some time after recovery.

How long is Shigella contagious?

The patient can infect others for several days during and after the illness, but sometimes for one to two weeks. Therefore, take special care of cleanliness even after the symptoms are over.

How is Shigella transmitted?

It is mainly spread through the fecal-oral route, i.e. through contaminated hands, food, water and surfaces. It is not spread by coughing or sneezing.

How do you get Shigella?

You can apply it by taking contaminated food or water, contact with a sick person or their consumables, taking dirty hands to the mouth, or swallowing water while swimming in contaminated water.

Can Shigella go away on its own?

Yes, mild infections in healthy adults often resolve on their own. But in children, the elderly and people with weakened immunity, it is necessary to see a doctor.

Is Shigella the same as food poisoning?

Shigella can be a cause of food poisoning, but not every food poisoning is shigella. Diarrhea with blood and phlegm and high fever are relatively more common in Shigella.

Is there a vaccine for Shigella?

There is currently no approved shigella vaccine available for general use, although research is ongoing. Therefore, clean and safe food is the most effective prevention.

Why is drug resistant Shigella dangerous?

Because such microbes are not eliminated by ordinary antibiotics. This makes treatment difficult, expensive, and prolonged, and may require hospitalization in severe cases.

Can I give my child anti-diarrhea medicine?

Do not give any medicine to children without the advice of a doctor. The safest course of action for the baby is ORS and immediate consultation with the doctor.۔

Conclusion

Shigella is a common but preventable infection. Its main symptoms include bloody or bulging diarrhoea, fever and stomach cramps, and it is mostly spread through hands, contaminated food and water. In mild cases, rest and adequate fluids may be sufficient, while severe or complex cases require antibiotics and hospital treatment under the supervision of a doctor.

The growing threat of drug resistant shigella in today’s times reminds us that it is not wise to self-medicate every diarrhoea. Proper diagnosis, responsible medication, and above all, hygienic habits can protect us and our children from this disease.

Remember: Washing hands with soap, drinking clean water, and preserving food are small habits, but these habits are the strongest shield against a disease like Shigella. If the symptoms are severe or there is any doubt, do not delay and consult a qualified doctor immediately

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