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Dengue Season Shifts: India Faces Year-Round Threat
11 Jun
Summary
- Dengue cases now appear outside traditional monsoon months.
- Rising temperatures and urbanization extend mosquito breeding seasons.
- Air pollution may worsen dengue severity and mortality rates.
Dengue, once considered a monsoon-specific disease in India, is now presenting a year-round public health challenge. Doctors across several states are observing an increase in cases weeks before the traditional rainy season. This shift is attributed to factors such as rising temperatures, unpredictable rainfall, and accelerating urbanization, which allow dengue-carrying mosquitoes to survive and spread more extensively.
Official data indicates a growing transmission window, with early-year case numbers exceeding previous full-season totals. In 2023, India recorded its highest dengue burden in recent history. While yearly fluctuations occur due to population immunity, the long-term trend shows a widening geographic and seasonal range for the disease.
Furthermore, studies suggest a link between long-term exposure to fine particulate air pollution (PM2.5) and higher dengue mortality rates. This pollution may worsen disease outcomes through systemic inflammation. Climate change, particularly temperature, rainfall, and humidity, also strongly influences dengue transmission patterns.
India is accelerating vaccine development, with Qdenga approved and indigenous candidates like 'DengiAll' in Phase III trials. However, experts emphasize that vaccination alone is insufficient. Continuous vector control, surveillance, sanitation, public awareness, and robust healthcare systems are essential for managing this evolving threat.
