Infectious gastroenteritis in adults and children: causes, symptoms, treatment and prevention

Vomiting, diarrhea, abdominal pain, and fever are symptoms that almost every family has encountered at least once. It is especially concerning when a child becomes ill: they become lethargic, refuse food and drink, and parents worry about dehydration.

Infectious gastroenteritis (acute intestinal infection) is one of the most common causes of acute gastrointestinal symptoms in both children and adults. In most cases, the condition resolves without serious consequences, but sometimes it can lead to dehydration and require medical care.

That is why it is important to understand why gastroenteritis occurs, what symptoms are typical, how to help the body, and when to seek medical attention.

What is infectious gastroenteritis?

Infectious gastroenteritis is inflammation of the stomach and/or intestinal lining, most commonly caused by viruses and less often by bacteria or parasites.

In simple terms, it is an intestinal infection that manifests as vomiting, diarrhea, and other digestive symptoms. When gastroenteritis develops in a child, medical supervision and proper care help normalize the condition quickly.

Most common pathogens:

Viruses:

• rotavirus;
• norovirus;
• adenovirus;
• astrovirus.

Bacteria:

• Salmonella;
• Campylobacter;
• Shigella;
• certain strains of Escherichia coli.

How is the infection transmitted?

Most commonly, infection is transmitted through:

• contaminated hands;
• contaminated water;
• food;
• contact with an infected person;
• shared household items.

In children, spread is especially fast in:

• daycare centers;
• schools;
• playrooms;
• camps.

Norovirus, for example, is highly contagious, so multiple family members may become ill.

Main symptoms of gastroenteritis

Most common symptoms include:

• diarrhea;
• vomiting;
• nausea;
• abdominal pain/cramps;
• fever;
• weakness;
• loss of appetite.

In children, additional symptoms may include:

• sleepiness;
• lethargy;
• irritability;
• refusal to eat or drink.

Symptoms usually last from a few days to a week depending on the cause.

Why is gastroenteritis dangerous?

The main risk is dehydration.

Vomiting and diarrhea cause rapid fluid and electrolyte loss. Adults usually tolerate this better, but young children can become dehydrated quickly.

Signs of dehydration:

• dry mouth;
• intense thirst;
• reduced urination;
• dark urine;
• dry lips;
• lethargy;
• sleepiness;
• no tears when crying.

When to seek urgent medical care?

In children:

• refusal to drink;
• signs of dehydration;
• severe sleepiness;
• seizures;
• blood in stool;
• repeated vomiting;
• severe abdominal pain;
• no urination.

In adults:

• severe dehydration;
• blood in stool;
• severe or localized abdominal pain;
• high fever;
• no improvement;
• marked weakness or dizziness.

How is gastroenteritis diagnosed?

In most cases, diagnosis is made after clinical examination and symptom assessment.

Additional tests are not always required.

Sometimes doctors may recommend:

• stool analysis;
• rapid tests for rotavirus or norovirus;
• blood tests;
• dehydration assessment.

Main treatment principles

Treatment is usually symptomatic.

Rehydration — the most important step

The main goal is to restore fluid loss.

Best options include:

• oral rehydration solutions;
• water;
• unsweetened drinks.

It is especially important to offer fluids frequently in small amounts, especially to children.

Even a few sips every 5–10 minutes can be important.

Nutrition

Modern guidelines recommend gradual return to normal eating.

Preferred:

• light foods;
• small portions;
• well-tolerated products.

Do not force a child to eat.

Are antibiotics needed?

In most cases — no.

Gastroenteritis is most often viral, and antibiotics do not work against viruses.

The decision about antibiotics must be made only by a physician.

Common treatment mistakes

Trying to “stop” diarrhea

Diarrhea is a protective mechanism.

Refusing fluids due to vomiting

Small and frequent fluid intake helps prevent dehydration.

Prevention: what really works?

Hand hygiene

• after toilet use;
• before eating;
• after diaper changes;
• after contact with an infected person.

Safe food and water

• wash fruits and vegetables;
• properly cook food;
• store food safely.

Rotavirus vaccination

Effective protection for children that reduces the risk of severe disease and hospitalization.

Practical recommendations

During illness:

• drink regularly;
• rest;
• avoid overloading the body with food;
• monitor dehydration signs;
• maintain hygiene.

Avoid:

• self-prescribed antibiotics;
• forcing food intake;
• excessive use of medications without medical advice.

Summary

Infectious gastroenteritis is a common condition in children and adults. In most cases, the body recovers on its own.

The key is adequate hydration, careful monitoring, and timely medical care if symptoms worsen.

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