Epidemiology & Outbreaks
Surveillance & Clinical Management of Dengue Serotypes (DENV 1-4) in the Terai & Kathmandu Valley
Early warning protocols, NS1 antigen testing timelines, fluid management algorithms, and vector biology of Aedes aegypti expanding into high-altitude hill districts.
Dr. A. Pokharel, MD, MPH · 5 min read
Changing Epidemiology of Vector-Borne Diseases
In recent years, Nepal has witnessed a geographic altitude shift in Aedes aegypti and Aedes albopictus mosquito vectors. Once confined to the southern Terai plains, dengue outbreaks have now become endemic in hilly metropolitan areas including Kathmandu, Pokhara, and Hetauda due to urban heat island effects and expanding transport corridors.
Clinical Staging & Warning Signs
The Epidemiology and Disease Control Division (EDCD) emphasizes risk-stratified triage:
- Group A (Home Care): Patients without warning signs, able to tolerate oral hydration, normal hematocrit.
- Group B (Inpatient Observation): Warning signs present (persistent abdominal pain, clinical fluid accumulation, mucosal bleed, lethargy, rising hematocrit with rapid drop in platelets).
- Group C (Emergency Intensive Care): Severe dengue featuring plasma leakage leading to shock, severe hemorrhage, or multiorgan impairment.
Public Health Countermeasures
- Integrated Vector Management (IVM) utilizing community-led Search and Destroy campaigns every Saturday morning.
- Enhancing district hospital diagnostic readiness with rapid NS1 and IgM ELISA testing kits.