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A reduce and replace strategy for suppressing vector-borne diseases: insights from a stochastic, spatial model.

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Releasing genetically modified mosquitoes with dual-action genes can reduce dengue-carrying mosquitoes. However, complete elimination of competent vectors is unlikely due to genetic factors and immigration.

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Area of Science:

  • Vector biology
  • Genetics
  • Epidemiology

Background:

  • Dengue virus transmission relies on competent mosquito vectors, primarily Aedes aegypti.
  • Transgenic mosquito strategies aim to control dengue by reducing vector populations or transmission.
  • Two main strategies include population reduction and population replacement.

Purpose of the Study:

  • To model the effectiveness of releasing transgenic Aedes aegypti mosquitoes with combined mortality and transmission-blocking genes.
  • To assess the potential for reducing competent vector populations and achieving disease control.

Main Methods:

  • Computer simulations were used to model the release of transgenic Aedes aegypti.
  • The model incorporated genes for conditional adult female mortality and virus transmission blocking.
  • Population dynamics, genetic drift, and immigration effects were considered.

Main Results:

  • The 'reduce and replace' strategy significantly decreased competent vector frequency below 50% two years post-release.
  • Complete fixation of anti-pathogen genes in the wild population was unlikely due to genetic drift and population recovery.
  • Releasing more individuals could be counterproductive if immigration of wild-type mosquitoes is high.

Conclusions:

  • The combined gene strategy is potentially more effective than single-gene approaches for reducing competent vectors.
  • Complete replacement of competent vectors is improbable, limiting disease eradication potential.
  • Spatially heterogeneous reductions in competent vectors may still contribute to decreased dengue incidence in endemic areas.