PRELIMS SNIPPETS – November 15th 2022

Dengue Fever

Why in News?

  • In a recent study, the ongoing spread of Dengue in India has been attributed to a late withdrawal of monsoon.


  • Dengue transmission is closely associated with three key factors — rainfall, humidity and temperature — which dictate the geographies in which dengue spreads and the transmission rate.
  • The number of months suitable for dengue transmission by Aedes aegypti mosquitoes has risen to 5.6 months each year.
  • It accounts for a 1.69% increase between 1951-1960 and 2012-2021.
  • The study projected “expansion of Aedes aegypti in the hot arid regions of the Thar Desert and Aedes albopictus in cold upper Himalayas as a result of future climatic changes.
  • Dengue spreads through the bite of two mosquitoes — Aedes aegypti and Aedes albopictus.
  • Currently, Aedes aegypti is prevalent in the southern peninsula, eastern coastline, north-eastern states and the northern plains.
  • Aedes albopictus dominates the eastern and western coastlines, north-eastern states and the lower Himalayas.
  • Dengue is a mosquito-borne tropical disease caused by the dengue virus (Genus Flavivirus), transmitted by several species of female mosquito within the genus Aedes, principally Aedes aegypti.
  • This mosquito also transmits chikungunya, yellow fever and Zika infection.
  • There are 4 distinct, but closely related, serotypes (separate groups within a species of microorganisms that all share a similar characteristic) of the virus that cause dengue (DEN-1, DEN-2, DEN-3 and DEN-4).
  • Its symptoms are Sudden high fever, severe headaches, pain behind the eyes, severe bone, joint, and muscle pain, etc.
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