Contaminated water is one of the leading causes of infectious diseases worldwide. Drinking or using water contaminated with bacteria, viruses, or parasites can lead to illnesses ranging from mild stomach infections to serious conditions that require hospitalization.

Waterborne diseases are especially common during the monsoon season, when flooding and poor sanitation can contaminate drinking water. Early diagnosis and timely treatment are essential to prevent complications.

What Are Waterborne Diseases?

Waterborne diseases are illnesses caused by drinking or coming into contact with water contaminated by harmful microorganisms or toxins.

Common waterborne diseases include:

  • Typhoid Fever
  • Cholera
  • Hepatitis A
  • Hepatitis E
  • Giardiasis
  • Amoebiasis
  • Dysentery
  • Acute Gastroenteritis

Each disease has different causes and requires appropriate medical evaluation and treatment.

Common Symptoms

Symptoms vary depending on the infection but may include:

  • Diarrhea
  • Vomiting
  • Fever
  • Stomach cramps
  • Nausea
  • Dehydration
  • Weakness
  • Loss of appetite
  • Headache
  • Jaundice (in some forms of viral hepatitis)

Severe dehydration can become life-threatening, especially in young children and older adults.

Who Is at Higher Risk?

The risk is higher for:

  • Children under 5 years
  • Older adults
  • Pregnant women
  • People with weakened immune systems
  • Travelers to areas with unsafe drinking water
  • Communities affected by floods or poor sanitation

Blood Tests That May Help Diagnose Waterborne Diseases

The choice of test depends on the suspected illness. A healthcare professional will decide which investigations are appropriate.

1. Complete Blood Count (CBC)

⭐ Recommended

A CBC is commonly ordered to evaluate White blood cell count, Hemoglobin, and Platelet count. While it does not identify the specific infection, it provides important information about the body's response to illness.

2. Typhoid Tests

If typhoid fever is suspected, your healthcare provider may recommend Typhi IgM Test, Blood Culture (especially early in the illness), or other tests based on clinical judgment.

3. Liver Function Test (LFT)

When Hepatitis A or Hepatitis E is suspected, an LFT helps assess liver health by measuring liver enzymes and bilirubin.

4. Electrolyte Test

Patients with prolonged diarrhea or vomiting may lose essential minerals such as sodium and potassium. An electrolyte test helps evaluate dehydration and guides treatment.

5. Kidney Function Test (KFT)

Severe dehydration can affect kidney function. A Kidney Function Test may be recommended in moderate to severe illness.

Other Diagnostic Tests

Depending on symptoms, a healthcare provider may also recommend Stool examination, Stool culture, Blood culture, Rapid antigen or antibody tests (for specific infections), or Viral hepatitis tests. These tests help identify the exact cause of the illness.

When Should You See a Doctor?

Seek medical care if you have:

  • High fever lasting more than two days
  • Severe diarrhea
  • Blood in the stool
  • Persistent vomiting
  • Signs of dehydration (dry mouth, dizziness, reduced urination)
  • Severe abdominal pain
  • Yellowing of the eyes or skin

Young children, older adults, and pregnant women should seek medical attention promptly if they develop these symptoms.

How to Prevent Waterborne Diseases

  • Drink boiled, filtered, or treated water.
  • Wash hands with soap before eating and after using the toilet.
  • Eat freshly cooked food.
  • Wash fruits and vegetables thoroughly with safe water.
  • Avoid consuming food from unhygienic sources.
  • Store drinking water in clean, covered containers.
  • Maintain good sanitation and proper waste disposal.

Can Waterborne Diseases Be Treated?

  • Oral rehydration solutions (ORS)
  • Intravenous fluids for severe dehydration
  • Antibiotics (only when prescribed for bacterial infections)
  • Antiparasitic medications (for certain parasitic infections)
  • Supportive care and adequate nutrition

Do not self-medicate with antibiotics, as they are not effective against viral infections and inappropriate use may contribute to antibiotic resistance.

Frequently Asked Questions

Can all waterborne diseases be diagnosed with a blood test?

No. Some conditions require stool tests, blood cultures, or other laboratory investigations. The appropriate test depends on the suspected disease.

Is diarrhea always caused by contaminated water?

No. Diarrhea has many possible causes, including foodborne infections, viruses, medications, and digestive disorders. A healthcare professional can help determine the cause.

What is the most common complication of waterborne diseases?

Dehydration is one of the most common and potentially serious complications, particularly in children and older adults.

Conclusion

Waterborne diseases are preventable, but they remain a significant health concern, especially during the rainy season. Safe drinking water, good hygiene, and early medical evaluation can reduce the risk of serious complications. If you develop persistent fever, diarrhea, vomiting, or signs of dehydration, consult a healthcare professional promptly. Tests such as CBC, Typhi IgM, Liver Function Test (LFT), and Kidney Function Test (KFT) may help guide diagnosis and treatment, depending on the suspected illness.