Bangladesh is no longer facing dengue as a simple seasonal disease. It has evolved into a complex public health challenge influenced by climate change, rapid urbanization, environmental degradation, changing human behavior, and weaknesses in vector control systems.
The alarming rise in dengue cases over the past several years clearly indicates that traditional approaches are no longer sufficient. Dengue prevention and control must now be viewed as a national development priority rather than merely a health-sector responsibility. The changing epidemiology of dengue in Bangladesh demands a fundamental shift in strategy.
Climate change: The new driver of transmission
Climate change isn't just altering ecosystems but actively reshaping infectious disease boundaries and elevating the spillover and epidemic risks of neglected, rare pathogens. Climate change has significantly altered the pattern of mosquito-borne diseases worldwide, and Bangladesh is among the countries most vulnerable to its consequences.
Rising temperatures, irregular rainfall, prolonged monsoon seasons, waterlogging, floods, and increasing humidity have created ideal conditions for the breeding and survival of Aedes mosquitoes. Previously, dengue transmission was largely concentrated between June and September. However, recent outbreaks have demonstrated that the transmission season has expanded beyond traditional boundaries.
Unpredictable weather patterns are allowing mosquitoes to reproduce more rapidly and survive for longer periods. Urban flooding creates countless artificial breeding sites, while warmer temperatures accelerate both mosquito development and viral replication.
Therefore, climate change adaptation strategies must be integrated into Bangladesh's dengue control policies. Public health authorities should collaborate closely with meteorological agencies, urban planners, environmental experts, and local government institutions to develop climate-informed dengue forecasting models.
Moving beyond fogging
One of the greatest misconceptions in Bangladesh is the belief that fogging alone can control dengue.
Fogging primarily targets adult mosquitoes and often provides only temporary relief. However, Aedes mosquitoes reproduce in small collections of clean, stagnant water found inside homes, on rooftops, in flowerpots, in discarded containers, on construction sites, in water storage facilities, etc.
The most effective intervention remains the destruction of mosquito breeding sites. Vector control should become a year-round activity rather than an emergency response implemented only after case numbers begin to rise.
The missing link
Dengue control ultimately depends on human behavior. The Aedes mosquito is predominantly a household mosquito and breeds in domestic environments and usually bites during the daytime.
Simple behavioral changes can dramatically reduce mosquito breeding:
- Cleaning water containers every week.
- Covering water storage facilities.
- Removing unused containers.
- Eliminating stagnant water from rooftops and construction sites.
- Using personal protective measures as necessary.
Unfortunately, many people continue to view dengue prevention as the sole responsibility of city corporations. This mindset must change. Behavioral change communication should become a continuous national campaign.
A sustainable solution?
Bangladesh must fully adopt integrated vector management (IVM) as the foundation of its dengue prevention strategy.
IVM is a comprehensive approach that combines:
- Environmental management.
- Vector surveillance.
- Biological and chemical control.
- Community participation.
- Evidence-based decision-making.
- Intersectoral collaboration.
Instead of conducting indiscriminate insecticide spraying, resources should be directed toward identifying mosquito breeding hotspots through entomological surveillance and geographic information system (GIS)-based mapping.
Integrated vector management also requires close coordination among the Ministry of Health and Family Welfare, city corporations, municipalities, educational institutions, the Ministry of Local Government, the Department of Environment, and urban development authorities. Dengue is not simply a medical problem; it is an environmental and governance challenge.
No country has successfully controlled dengue without active community participation. Community engagement should move beyond awareness campaigns and evolve into community ownership. Neighborhood-based clean-up campaigns, school health programs, youth volunteer initiatives, and community surveillance teams can significantly reduce mosquito breeding sites.
A nationwide weekly "Dengue Clean Day" could become an effective public health intervention. Local communities should be encouraged to inspect their homes and surroundings regularly and report potential breeding sites to local authorities. Bangladesh's own dengue strategy recognizes community participation as the key to sustainable dengue control.
Urban planning matters
Rapid and often unplanned urbanization has transformed many areas of Bangladesh into favourable environments for Aedes mosquitoes. Blocked drainage systems, indiscriminate waste disposal, plastic containers, abandoned tires, rooftop water accumulation, and poorly managed construction projects continue to create ideal breeding habitats. Environmental sanitation should therefore become an integral component of dengue prevention.
Priority actions should include:
- Strengthening solid waste management.
- Ensuring regular drain maintenance.
- Enforcing construction site regulations.
- Improving water management systems.
- Eliminating waterlogging.
The responsibility for environmental sanitation extends far beyond the health sector. Urban planners, engineers, municipal authorities, construction companies, and communities must work together to reduce environmental risks. Bangladesh's current guidance specifically highlights waste management and sanitation as critical components of dengue prevention.
Institutional preparedness
Every year, hospitals become overwhelmed when dengue cases begin to surge. This reactive approach must be replaced by proactive preparedness.
Institutional readiness should include:
- Dedicated dengue corners in hospitals.
- Standardized clinical management protocols.
- Adequate supplies of intravenous fluids.
- Sufficient laboratory capacity.
- Trained physicians and nurses.
- Efficient triage systems.
Health facilities should begin preparing before the onset of the monsoon rather than waiting for patient numbers to increase. Early diagnosis and appropriate case management remain the most effective ways to reduce dengue-related deaths. These preparedness measures are also emphasized in national recommendations.
The vaccine possibility
The World Health Organization (WHO) currently recommends the use of the dengue vaccine Qdenga® (TAK-003) for children aged 6-16 years living in areas with high dengue transmission intensity.
Importantly, vaccination should never replace traditional prevention measures. WHO clearly states that dengue vaccines should be implemented as part of a comprehensive dengue control strategy.
Data must drive action
One of the most important lessons from recent dengue outbreaks is that surveillance systems must become more predictive.
Traditional case reporting alone is insufficient. Bangladesh requires an integrated early warning system that combines:
- Real-time disease surveillance.
- Entomological surveillance.
- Climate and rainfall data.
- GIS-based hotspot mapping.
- Community-based event reporting.
- Digital health technologies.
A modern surveillance system should identify high-risk areas before outbreaks occur rather than simply documenting cases after transmission has already intensified.
Effective surveillance can provide policy-makers with the information needed to deploy resources, strengthen vector control, and prepare health facilities in advance. National strategies already emphasize real-time reporting, hotspot mapping, and early warning systems.
Prevention must begin before the rain
Bangladesh continues to repeat the same mistake every year by initiating dengue control activities after the arrival of the monsoon. This approach must change. Seasonal preparedness should begin at least two to three months before the rainy season and include:
- Pre-monsoon vector surveys.
- Community clean-up campaigns.
- Insecticide and larvicide procurement.
- Hospital preparedness assessments.
- Public awareness campaigns.
- Stockpiling essential medical supplies.
Dengue control activities should follow an annual preparedness calendar rather than an emergency response model. Current guidance recommends that control activities begin before the peak transmission season.
A whole-of-society approach
Bangladesh has successfully addressed many major public health challenges through strong political commitment and multisectoral collaboration. Dengue should be approached in the same way.
The country needs a whole-of-government and whole-of-society approach that brings together:
- Government ministries.
- City corporations and municipalities.
- Hospitals and healthcare institutions.
- Educational institutions.
- Community organizations.
- The private sector.
- Citizens.
The fight against dengue requires behavioral change, environmental responsibility, scientific surveillance, climate adaptation, institutional preparedness, and community ownership.
Dengue is no longer merely a seasonal outbreak. It is a warning signal about the intersection of climate change, urbanization, environmental neglect, and public health vulnerability.
Dr M Salim Uzzaman is a public health specialist & strategist (expert: EIDs, disease surveillance, One Health, and global health security).
The views expressed are personal.