🦟 Dengue Fever — Types, Causes, Symptoms, Treatment & Prevention
Everything you need to know about dengue fever: types, causes, symptoms, diagnosis, treatment, prevention, and management for patients and communities
📑 Table of Contents
🤔 What is Dengue Fever?
Dengue fever is a mosquito-borne viral infection caused by the dengue virus. It is transmitted to humans through the bite of infected Aedes mosquitoes, primarily Aedes aegypti and Aedes albopictus.
Dengue is a major public health concern in tropical and subtropical regions, including:
- South and Southeast Asia
- Central and South America
- Caribbean
- Africa
- Pacific Islands
📊 Dengue Serotypes
There are four distinct serotypes of the dengue virus (DENV-1, DENV-2, DENV-3, DENV-4). Infection with one serotype provides lifelong immunity to that specific serotype but not to the others.
🩸 DENV-1
Most common serotype globally
- Associated with classic dengue
- Less severe than DENV-2
🩸 DENV-2
Often associated with severe dengue
- Higher risk of dengue hemorrhagic fever
- More severe symptoms
🩸 DENV-3
Emerging in many regions
- Associated with outbreaks
- Moderate severity
🩸 DENV-4
Less common but still dangerous
- Similar to DENV-1
- Milder symptoms generally
🔄 How Dengue Spreads
Mosquito Bite
Aedes aegypti mosquito bites an infected person
Virus Multiplies
Virus multiplies in the mosquito
Bites Another Person
Infected mosquito bites a healthy person
Human to Mosquito
Person becomes a reservoir for new mosquitoes
⏳ The 3 Phases of Dengue
Phase 1: Febrile Phase
Days 1-3
High fever (40°C/104°F), headache, muscle pain, joint pain, rash
Phase 2: Critical Phase
Days 4-7
Plasma leakage, bleeding, low platelets, organ impairment
Phase 3: Recovery Phase
Days 7-10
Improvement, reabsorption of fluid, rash reappears
🚨 Symptoms of Dengue
High Fever
Sudden high fever up to 40°C (104°F)
Severe Headache
Intense pain behind the eyes
Muscle & Joint Pain
"Breakbone fever" — severe pain
Nausea & Vomiting
Loss of appetite, vomiting
Bleeding
Nosebleeds, gum bleeding, bruising
Rash
Red rash on the skin
🚨 Warning Signs of Severe Dengue
Seek immediate medical attention if you or someone you know experiences these warning signs:
Severe Abdominal Pain
Persistent, intense stomach pain
Bleeding
Vomiting blood, black stools, heavy menstrual bleeding
High Fever
Fever lasting more than 3 days
Confusion
Disorientation, restlessness
Dehydration
Reduced urination, dry mouth
Rapid Breathing
Difficulty breathing
🩺 How Doctors Diagnose Dengue
Diagnosing dengue involves a combination of clinical assessment and laboratory tests. Here's the process:
Clinical Assessment
Review symptoms, travel history, and exposure to mosquitoes
Complete Blood Count (CBC)
Check platelet count, hematocrit, and white blood cell count
NS1 Antigen Test
Detects dengue virus in first 5 days of symptoms
IgM/IgG Antibody Test
Detects antibodies after day 5 of symptoms
PCR Test
Molecular test to confirm the virus and serotype
Monitor for Complications
Liver function, electrolyte levels, and bleeding risk
📋 Key Diagnostic Indicators
- Platelet Count: Decreases significantly in dengue (normal: 150,000-450,000)
- Hematocrit: Increases due to plasma leakage
- Tourniquet Test: Positive in many dengue patients
- NS1: Positive in the first 5 days
💊 Treatment Options
Hydration
Drink plenty of fluids (oral rehydration solution, water, clear fluids). Avoid dark-colored drinks.
Pain & Fever Relief
Paracetamol/Acetaminophen for fever and pain. AVOID Aspirin and Ibuprofen.
Hospitalization
For severe dengue: IV fluids, electrolyte replacement, and close monitoring.
Blood Transfusion
In cases of severe bleeding and very low platelet count.
Rest & Recovery
Complete rest, monitoring platelet levels, and follow-up care.
🛡️ Prevention Strategies
Use Mosquito Repellent
Apply DEET, picaridin, or oil of lemon eucalyptus
Wear Protective Clothing
Long sleeves, long pants, socks
Use Window Screens
Keep mosquitoes out of homes
Remove Standing Water
Eliminate mosquito breeding sites
Get Vaccinated
Dengvaxia for those with previous infection
Mosquito Nets
Especially during daytime naps
- Cover water storage containers
- Clean flower pots and vases regularly
- Dispose of old tires and containers
- Clean gutters and drains
💉 Dengue Vaccination
💉 Dengvaxia
- Live, attenuated vaccine
- Requires prior dengue infection confirmation
- 3 doses (0, 6, 12 months)
- Recommended for ages 9-45
- Available in endemic countries
🧪 New Vaccines
- TAK-003: 2-dose vaccine
- TV005: Single-dose vaccine
- Under development/research
- May work for dengue-naive individuals
✅ Do's and Don'ts
✅ Do's
- Drink plenty of fluids (water, ORS, clear liquids)
- Take Paracetamol for fever and pain
- Use mosquito repellent
- Wear long sleeves and pants
- Eliminate standing water
- Monitor platelet count
- Seek medical help immediately for warning signs
❌ Don'ts
- Don't take Aspirin or Ibuprofen (risk of bleeding)
- Avoid dark-colored drinks (can hide blood in vomit)
- Don't ignore warning signs
- Avoid unnecessary travel during outbreaks
- Don't self-medicate
- Avoid mosquito bites
- Don't wait for symptoms to worsen
👨⚕️ Which Doctor to See
💪 Recovery & Management
Stay Hydrated
Continue drinking fluids during recovery
Rest
Complete rest for 1-2 weeks
Monitor Platelets
Follow up with blood tests
Healthy Diet
Nutritious foods to rebuild strength
Follow-up
Regular checkups after recovery
Prevent Future Infections
Continue prevention measures
🎯 Conclusion
Dengue fever is a serious but preventable disease. With community awareness, effective mosquito control, early detection, and proper medical care, we can significantly reduce the impact of dengue. Remember: Prevention is the best medicine — eliminate mosquito breeding sites, protect yourself from bites, and seek early medical help.
💪 Remember: Every effort to fight the bite helps protect our communities. Stay safe, stay informed, and act fast!
⚠️ Disclaimer: This information is for educational purposes only and should not replace professional medical advice. Always consult a healthcare provider for proper diagnosis and treatment.