Dengue Fever

Overview

Dengue fever is a mosquito-borne viral disease transmitted by infected Aedes mosquitoes. It is not contagious between people and requires specific vector control measures for prevention. Dengue can range from mild illness to severe, life-threatening complications.

Transmission

Vector-Borne Disease

  • Primary Vectors: Aedes aegypti and Aedes albopictus mosquitoes
  • Not Person-to-Person: “Not contagious and does not spread directly from person to person”
  • Mosquito Infection: Mosquitoes become infectious after biting a dengue-infected person
  • Geographic Distribution: Common in tropical and subtropical regions

Mosquito Characteristics

  • Day Biters: Aedes mosquitoes are most active during daytime
  • Breeding Sites: Prefer clean, stagnant water for egg laying
  • Urban Mosquitoes: Well-adapted to urban environments
  • Indoor and Outdoor: Can breed both inside and outside homes

Symptoms

Onset and Duration

  • Incubation Period: Symptoms develop 4-7 days after mosquito bite
  • Fever Duration: Sudden fever lasting 2-7 days
  • Variable Severity: Can range from mild to severe illness

Primary Symptoms

  • Sudden High Fever: Characteristic abrupt onset
  • Severe Headache: Often intense and persistent
  • Joint and Muscle Pain: Severe aches throughout body
  • Skin Rashes: May appear during or after fever
  • Nausea and Vomiting: Gastrointestinal symptoms
  • Potential Bleeding: Nosebleeds, gum bleeding, easy bruising

Additional Symptoms

  • Eye pain (retro-orbital pain)
  • Loss of appetite
  • Abdominal pain
  • Fatigue and weakness
  • Restlessness

Disease Progression

Phases of Dengue

  1. Febrile Phase: High fever and systemic symptoms
  2. Critical Phase: Risk of complications and plasma leakage
  3. Recovery Phase: Gradual improvement and fluid reabsorption

Warning Signs

  • Severe abdominal pain
  • Persistent vomiting
  • Rapid breathing
  • Bleeding gums
  • Blood in vomit
  • Restlessness or fatigue

Complications

Severe Dengue

  • Dengue Hemorrhagic Fever: Characterized by bleeding and low platelet count
  • Dengue Shock Syndrome: Life-threatening circulatory failure
  • Plasma Leakage: Fluid leakage from blood vessels

Life-Threatening Complications

  • Potentially Fatal: Severe cases can be deadly without proper medical care
  • Organ Impairment: Liver, heart, and other organ involvement
  • Bleeding Disorders: Severe bleeding complications
  • Circulatory Failure: Shock and cardiovascular collapse

Treatment

No Specific Antiviral Treatment

  • Supportive Care: “No specific treatment for dengue”
  • Symptom Management: Focus on maintaining patient stability
  • Monitoring: Close observation for complications
  • Hospitalization: May be required for severe cases

Medical Management

  • Fluid Replacement: Intravenous fluids for severe cases
  • Blood Transfusions: May be necessary for severe bleeding
  • Intensive Care: For patients with complications
  • Pain Management: Paracetamol (avoid aspirin due to bleeding risk)

Prevention Strategies

Vector Control

  • Eliminate Breeding Sites: Remove stagnant water sources
  • Water Storage: Proper covering of water containers
  • Regular Cleaning: Empty and clean water storage regularly
  • Community Effort: Coordinated neighborhood vector control

Personal Protection

  • Mosquito Repellents: Use effective repellents during day
  • Protective Clothing: Long sleeves and pants, especially during peak hours
  • Mosquito Nets: Use in areas with high mosquito activity
  • Air Conditioning/Fans: Reduce mosquito activity indoors

Environmental Management

  • Remove Water Collection: Eliminate containers that collect rainwater
  • Proper Drainage: Ensure good drainage around homes
  • Garden Maintenance: Keep gardens free of water-holding containers
  • Regular Inspection: Check for potential breeding sites

Vaccination

Available Vaccine

  • Age Group: Available for individuals aged 12-45 years
  • Pre-vaccination Screening: May require testing for previous dengue exposure
  • Consultation Required: Discuss with healthcare provider for suitability
  • Not Universal: Not recommended for all populations

Public Health Response

Government Resources

  • MOH Hotline: 1800 225 4122 for health information
  • NEA Hotline: 1800 933 6483 for environmental issues
  • Regular Updates: Available on Ministry of Health website
  • Surveillance: Active monitoring of dengue cases and outbreaks

Community Involvement

  • Public Education: Community awareness programs
  • Reporting: Report potential breeding sites to authorities
  • Cooperation: Participate in vector control efforts
  • Early Detection: Seek medical care for dengue-like symptoms

When to Seek Medical Care

Immediate Medical Attention

  • High fever with severe headache
  • Persistent vomiting
  • Severe abdominal pain
  • Difficulty breathing
  • Signs of bleeding
  • Unusual drowsiness or restlessness

High-Risk Populations

  • Pregnant women
  • Young children
  • Elderly individuals
  • People with chronic conditions
  • Previous dengue infection (risk of severe dengue)

Important Reminders

  • Prevention is Key: Vector control is the most effective prevention
  • Early Medical Care: Seek medical attention for dengue-like symptoms
  • No Self-Medication: Avoid aspirin and non-steroidal anti-inflammatory drugs
  • Community Responsibility: Everyone’s role in eliminating breeding sites
  • Stay Informed: Follow public health updates and guidelines

Emergency Contacts

  • Health Information: MOH Hotline 1800 225 4122
  • Environmental Issues: NEA Hotline 1800 933 6483
  • Medical Emergency: Call emergency services immediately for severe symptoms

Understanding dengue fever helps communities take appropriate preventive measures and ensures individuals seek timely medical care when symptoms develop.