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Is outdoor vector control needed for malaria elimination? An individual-based modelling study.

Lin Zhu1, Günter C Müller2,3, John M Marshall4

  • 1Department of Public Health Sciences, Miller School of Medicine, University of Miami, Miami, FL, USA. l.zhu3@med.miami.edu.

Malaria Journal
|July 5, 2017
PubMed
Summary
This summary is machine-generated.

Combining indoor long-lasting insecticidal nets (LLINs) with outdoor attractive toxic sugar bait (ATSB) stations significantly reduced malaria vectors and transmission in simulated African villages. Outdoor interventions are crucial for integrated vector management (IVM) to achieve malaria elimination.

Keywords:
ATSBAgent-based modelAnopheles gambiaeIndividual-based modelLLINMalaria eliminationOutdoor vector controlResidual malaria transmission

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Area of Science:

  • Vector control
  • Malaria elimination
  • Mathematical modeling

Background:

  • Residual malaria transmission persists despite widespread indoor vector control like long-lasting insecticidal nets (LLINs).
  • Increased insecticide resistance in mosquitoes reduces LLIN efficacy and may drive outdoor transmission.
  • Integrated Vector Management (IVM) strategies are exploring the addition of outdoor interventions.

Purpose of the Study:

  • To model the impact of combining indoor (LLINs) and outdoor (ATSB) interventions on malaria transmission in a simulated African village.
  • To evaluate different intervention scenarios and their efficacy periods on mosquito populations and malaria transmission rates.

Main Methods:

  • A spatial individual-based model simulated malaria transmission in a hypothetical African village.
  • Interventions modeled included LLINs and outdoor attractive toxic sugar bait (ATSB) stations.
  • Simulations assessed mosquito population, entomologic inoculation rates (EIR), and local mosquito extinction probabilities over 420 days.

Main Results:

  • Combined LLINs and ATSBs significantly reduced mosquito populations and EIR in clustered housing settings compared to LLINs alone.
  • Outdoor ATSBs alone also reduced mosquito populations and increased extinction probability.
  • A minimum efficacy period of 2-3 months was needed for optimal and long-term vector control effects.

Conclusions:

  • Incorporating outdoor vector control, such as ATSBs, into IVM is valuable for malaria elimination in Africa.
  • Outdoor interventions can supplement indoor methods, particularly in settings like clustered villages where LLINs alone are insufficient.
  • The findings support the strategic use of combined indoor and outdoor tools for enhanced malaria vector control.