GASTROENTERITIS

UNDERSTANDING GASTROENTERITIS: THE STOMACH FLU YOU SHOULDN’T IGNORE.

Every year, millions of people fall ill from gastroenteritis, a common yet often underestimated infection of the stomach and intestine.

In Africa, the incidence remains high, especially among children under five. A systematic review of diarrhoeal disease among children under five in Africa (2013-2023) found that major geographic, socioeconomic and environmental factors drive these infections.

Viral agents such as rotavirus and norovirus account for most cases, posing a significant burden on health systems, families, and communities.

This burden varies by region, age, study design, vaccination status, and diagnostic approach.

Beyond its physical effects, recurrent diarrhoea can lead to dehydration, hospitalisation, and even death, especially in young children

According to the World Health Organization, diarrheal diseases (including gastroenteritis) remain among the top causes of illness and death in children under five, especially in developing countries.

Poor sanitation, unsafe water, and contaminated food continue to fuel its spread making it not just a personal health issue, but a public health concern.

WHAT IS GASTROENTERITIS.
Gastroenteritis, often called the stomach flu, is an inflammation of the stomach and intestines caused by infection with viruses, bacteria, or parasites. Inflammation makes these organs swell and sore. It leads to diarrhea, vomiting, stomach cramps, and dehydration.
Although usually mild and short-lived, gastroenteritis can be dangerous, especially for infants, older adults, and people with weakened immune systems.

COMMON CAUSES OF GASTROENTERITIS
Gastroenteritis happens when the immune system activates to defend the stomach and intestines from harm. It sends inflammatory cells to help fight infections and repair injured tissues.

This is usually a temporary (acute) response to temporary threat or injury. It takes a short time to work, and then, the inflammation goes away. Longer lasting (persistent) gastroenteritis is unusual.

The condition can be caused by various infectious agents:

1. Viral Gastroenteritis
Viruses are the leading cause.

The most common are:

• Norovirus: Causes outbreaks in schools, restaurants, and cruise ships.
• Rotavirus: Common in infants and young children, but preventable through vaccination.
• Adenovirus and Astrovirus: Often affect children and the elderly.

2. Bacterial Gastroenteritis
Bacterial infections cause bacterial gastroenteritis

Foodborne bacteria are another major cause:

• Escherichia coli (E. coli)
• Salmonella
• Shigella
• Campylobacter
• Staphylococci (staph)
• Clostridioides difficile (C. diff)

3. Parasitic Gastroenteritis
Parasites can also infect the intestines, common parasite infections include;

• Giardiasis
• Entamoeba histolytica
• Cryptosporidiosis
• Cyclosporiasis
• Amebiasis (amoebic dysentery)

4. Non-Infectious Causes
Food intolerance (e.g., lactose intolerance)

Certain medications (antibiotics, NSAIDs).

5. Chemical gastroenteritis
Chemicals can injure and inflame the lining of the stomach and intestines. Some chemicals do this even in small amounts. Others, like alcohol and certain medications, can cause gastroenteritis in larger doses

Causes of chemical gastroenteritis includes;

• Heavy metal poisoning
• Plant toxins, like poisonous mushrooms
• Cocaine
• Chemotherapy drugs
• Alcohol overuse
• Nsaid overuse

Digoxin overuse

COMMON SIGNS AND SYMPTOMS OF GASTROENETERITIS
Diarrhea
Vomiting
Abdominal pain and cramping
Nausea
Fever
Malaise
Dehydration
Chills

IS GASTROINTERITIS CONTAGIOUS?

Infectious gastroenteritis is contagious, when there is an infection in the gastrointestinal system, it infects the poop. Infections can spread from poop to anyone who comes into contact with it.

Microscopic traces of poop can linger on bathroom surfaces, diapers, changing areas and people’s hands if they don’t wash well. These traces can transfer to others who touch them, or their food or water.

Chemical gastroenteritis is not contagious, but it can affect people in one place at one time.

DIAGNOSIS

Diagnosis is often made through:

Clinical evaluation: Based on symptoms and physical examination.

Stool tests: To identify bacteria, parasites, or viruses.

Blood tests: To check electrolyte balance and dehydration severity (in serious cases).

TREATMENT OPTIONS
Most cases of gastroenteritis resolve on their own within a few days. The main goal of treatment is to prevent dehydration and manage symptoms.

1. Rehydration

Oral Rehydration Solution (ORS) is the best remedy for mild to moderate dehydration.

For severe dehydration, intravenous fluids (IV) may be necessary.

2. Diet and Rest

Eat bland, easily digestible foods like rice, bananas, toast, and applesauce.

Avoid caffeine, alcohol, and fatty or spicy foods.

Get enough rest to help your body recover.

3. Medications

Antiemetics: Help control nausea and vomiting.

Antipyretics: Reduce fever and discomfort.

Antibiotics: Only prescribed if a bacterial infection is confirmed (e.g., cholera, shigellosis).

Avoid antidiarrheal drugs (especially in children) unless recommended by a healthcare provider.

PREVENTION
Gastroenteritis can be prevented through good personal hygiene, safe food, and water practices, and appropriate immunization.

Since the condition is commonly spread through contaminated food, water, or close contact with infected individuals, preventive measures focus on breaking these routes of transmission.

1. Personal Hygiene

• Wash hands thoroughly with soap and clean water, especially before eating or preparing food, after using the toilet, changing diapers or caring for someone who is ill.

• Encourage regular handwashing among children, as they are more prone to spreading infections.

2. Safe drinking Water

• Drink only clean and safe water.

• In areas where water quality is uncertain, boil water, use water filters, or apply water purification methods to prevent waterborne infection.

3. Food Safety Practices

• Cook food thoroughly, especially meat, poultry, eggs, and seafood, to kill harmful microorganisms.
• Avoid eating raw or undercooked foods.
• Wash fruits and vegetables properly before consumption.
• Store food at appropriate temperatures and refrigerate leftovers promptly.

4. Kitchen and Environmental Cleanliness

• Clean and disinfect kitchen surfaces, utensils, and cutting boards after handling raw foods to prevent cross-contamination.
• Dispose of waste properly and maintain clean toilet facilities

5. Vaccination

• Ensure children receive the rotavirus vaccine, which significantly reduces the risk of severe gastroenteritis in infants and young children.

7. Travel Precautions

• When traveling, especially to areas with poor sanitation, avoid unsafe street food, unpasteurized milk, and untreated water.

COMPLICATIONS
If gastroenteritis is not properly treated, especially in vulnerable groups such as infants, young children, the elderly, and individuals with weakened immune systems, it can lead to serious health complications.

1. Severe Dehydration
Frequent diarrhea and vomiting cause significant loss of fluids from the body. When fluids are not adequately replaced, severe dehydration can occur. This may present with symptoms such as dry mouth, reduced urine output, sunken eyes, lethargy, and low blood pressure. Severe dehydration is a medical emergency and can be life-threatening if not promptly treated.

2. Electrolyte Imbalance
Along with fluid loss, essential electrolytes such as sodium, potassium, and chloride are lost. Imbalances can disrupt normal body functions, leading to muscle weakness, cramps, irregular heart rhythms, confusion, and seizures in severe cases.

3. Acute Kidney Failure
In cases of prolonged or severe dehydration, reduced blood flow to the kidneys can impair their function, resulting in acute kidney injury or failure. Although this complication is rare, it is more likely in severe cases and in individuals with pre-existing kidney disease.

4. Malnutrition
Repeated diarrhea interferes with nutrient absorptionin the intestines. In children, this can lead to poor weight gain, stunted growth, and weakened immunity. Chronic or recurrent gastroenteritis significantly increases the risk of malnutrition, particularly in low-resource settings.

5. Hypovolemic Shock
Extreme fluid loss can reduce circulating blood volume, leading to shock. This is characterized by low blood pressure, rapid pulse, coldextremities, and altered consciousness, and requires immediate medical attention.

6. Secondary Infections
A weakened immune system and damaged gut lining may predispose individuals to secondary bacterial infections, prolonging illness and recovery.

7. Worsening of Pre-existing Conditions
Gastroenteritis may exacerbate underlying conditions such as diabetes, heart disease, or kidney disorders due to dehydration and electrolyte disturbances.

WHEN TO SEE A DOCTOR

Seek immediate medical care if you experience:

Blood or mucus in stool

Persistent vomiting

High fever

Signs of dehydration

Symptoms lasting more than three days

CONCLUSION

Gastroenteritis remains one of the leading causes of childhood mortality in low- and middle-income countries. Improving access to clean water, sanitation, and education about handwashing are vital steps toward reducing its burden. Gastroenteritis is preventable and treatable. With proper hygiene, safe food handling, and early medical care, you can avoid complications and protect your health.