2025 · Paper V · 10 marksFrequently asked

Describe the relationship between deforestation and the emergence of infectious diseases.

In short

Deforestation drives infectious disease by pushing wildlife towards people, eroding the biodiversity that regulates pathogens, letting vectors like mosquitoes spread, and favouring rodent reservoirs at forest edges. Nipah spread from displaced fruit bats in Malaysia, and Andhra Pradesh's forest-fringe districts have seen more dengue, malaria and scrub typhus.

Model answer

Ghissu Editorial · Verified 4 Oct 2026

Introduction
Deforestation disrupts ecosystems, increasing zoonotic spillovers and infectious diseases, especially in biodiverse Indian regions like Andhra Pradesh. The loss of forest cover not only threatens biodiversity but also heightens public health risks by facilitating pathogen transmission from wildlife to humans.
How Deforestation Contributes to Infectious Diseases
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Habitat Disruption Increases Spillover

Fragmentation in Andhra Pradesh’s Eastern Ghats forces wildlife closer to humans, raising zoonotic risks. This proximity increases encounters with disease reservoirs such as bats and primates.

Mechanisms Linking Deforestation to Disease Outbreaks
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Vector Expansion and Host Shifts

Deforestation enables mosquitoes and ticks to invade new areas, increasing malaria and dengue in Andhra Pradesh; defaunation shifts reservoirs to rodents. The altered habitats create breeding grounds for vectors, intensifying disease spread.

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Livestock as Transmission Bridges

Domestic animals near degraded forests in Andhra Pradesh facilitate pathogen transfer from wildlife to humans. Mixed farming practices increase interfaces where zoonotic pathogens can jump species.

Examples Illustrating the Relationship
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Nipah Virus and Habitat Loss

Malaysian deforestation pushed bats into human areas, causing Nipah outbreaks, illustrating zoonotic spillover from forest loss. This case highlights how agricultural expansion near forests can trigger pandemics.

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Vector-Borne Disease Rise in Andhra Pradesh

Increased dengue and malaria in forest-fringe districts correlate with deforestation and fragmentation. The state’s health reports confirm rising incidence linked to ecological changes.

Way Forward
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Strengthen Forest Conservation

Enforce laws and community management in Andhra Pradesh to reduce habitat loss and spillover. Initiatives like Joint Forest Management can empower local communities in conservation efforts.

Conclusion
Integrated conservation and health policies are essential to curb deforestation-driven infectious diseases. Addressing ecological and social dimensions together will help prevent future zoonotic outbreaks.

This model answer is indicative and the model can make mistakes; please verify key facts independently.

Hand-drawn diagram: From forest loss to outbreaks. From forest loss to outbreaks. Flow: Forests cleared and fragmented → Wildlife and vectors near settlements → Livestock act as bridge hosts → Pathogens spill over to humans → Nipah, malaria, dengue outbreaks
Diagram: From forest loss to outbreaks

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Question from the official APPSC Group-I Mains 2025 paper. Answer written by Ghissu's engine and checked against our editorial standards. Found an error? Tell us and we correct it within 48 hours.

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