Aedes Aegypti Mosquito

📖 Description

Aedes aegypti — the Yellow Fever Mosquito — is the single most important arbovirus vector in India and is responsible for transmitting dengue, chikungunya, Zika, and yellow fever viruses. India bears one of the world’s largest dengue burdens: the National Center for Disease Control (NCDC) reported ~233,000 dengue cases and ~1,100 deaths in 2022, with the actual case count estimated at 5–10× higher due to under-reporting of mild cases. The annual economic cost of dengue in India is estimated at ~US$1.3 billion (₹11,000 crore) in direct medical expenses and lost productivity. The species is uniquely adapted to the human-built environment — it breeds almost exclusively in artificial water-holding containers (water storage drums, discarded tyres, flower pots, coconut shells, rainwater harvesting tanks) and bites humans almost exclusively, making it a ‘domesticated’ mosquito that follows humans wherever they settle. Agricultural environments are disproportionately high-risk: the species thrives in irrigation infrastructure (drip-line catch-pots, sprinkler heads, water storage tanks), in plantation crop axils (banana, heliconia, bromeliads), and in rainwater harvesting systems increasingly adopted on Indian farms. Climate change is expanding A. aegypti’s range poleward — it is now established in the Himalayan foothills (Dehradun, Kathmandu) where it was absent a decade ago. The species’ life history is also unusual: eggs survive drying for up to 8 months, allowing the species to persist through long dry spells in apparently empty containers and re-emerge with the next rain. This ‘egg desiccation resistance’ makes A. aegypti uniquely difficult to eradicate — containers must be physically scrubbed, not merely emptied, to remove the eggs.