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Intermediate forest cover and malaria risk in an Amazon deforestation frontier
Gabriel Z Laporta1, Denis Valle2, Paula R Prist3
1Graduate Program in Health Sciences, FMABC Medical School University Center, Santo André, SP, Brazil; Center for Natural and Human Sciences, Federal University of ABC, São Bernardo do Campo, SP, Brazil.
Acta Tropica
|August 1, 2025
Summary
Malaria risk is highest in Amazonian areas with 50% forest cover. Intermediate forest cover and fragmentation increase infected mosquito populations and human malaria cases, complicating elimination efforts.
Area of Science:
- Ecology
- Epidemiology
- Vector-borne diseases
Background:
- Malaria transmission dynamics are influenced by landscape structure, particularly in deforestation frontiers.
- Understanding the relationship between forest cover, vector ecology, and human malaria incidence is crucial for effective control.
Purpose of the Study:
- To investigate how landscape configuration, specifically forest cover and fragmentation, affects anopheline mosquito abundance, infection rates, and human malaria incidence in the Brazilian Amazon.
- To identify optimal landscape conditions that promote malaria transmission and inform elimination strategies.
Main Methods:
- A pilot natural experiment was conducted across 40 sites in Acre state, Brazilian Amazon, representing a gradient of forest cover.
- Data collected included mosquito vector abundance and infection rates (Plasmodium vivax, Plasmodium falciparum), and human malaria case detection.
- Statistical analyses assessed the influence of landscape structure on vector and human infection data.
Main Results:
- Sites with intermediate forest cover (around 50%) and high fragmentation showed increased Nyssorhynchus mosquito abundance and higher anopheline infection rates.
- These conditions correlated with a greater risk of human Plasmodium infections, predominantly asymptomatic.
- Asymptomatic infections represent a significant reservoir for ongoing malaria transmission.
Conclusions:
- Intermediate forest cover, often linked to fragmentation, creates conditions conducive to malaria transmission in the Amazon, even with drug-based interventions.
- Malaria elimination strategies must incorporate radical cure treatments and novel vector control targeting outdoor-biting mosquitoes.
- Landscape-based management, including forest conservation and restoration, can aid in regulating vector populations and supporting malaria elimination alongside environmental preservation.
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