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To Kill or to Repel Mosquitoes? Exploring Two Strategies for Protecting Humans and Reducing Vector-Borne Disease

M Moreno-Gómez1, M A Miranda2, R Bueno-Marí3,4

  • 1Research and Development (R&D) Insect Control Department, Henkel Ibérica S.A, Carrer Llacuna 22, 1-1, 08005 Barcelona, Spain.

Pathogens (Basel, Switzerland)
|September 28, 2021
PubMed
Summary
This summary is machine-generated.

Spatial repellents offer significant human protection against mosquitoes, even at doses that do not kill them. This finding suggests a new approach for vector control to reduce public health risks globally.

Keywords:
Aedes albopictusfield testingkillinglanding rate countprotectionspatial repellenttransfluthrin

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Area of Science:

  • Public Health
  • Entomology
  • Environmental Science

Background:

  • Vector-borne diseases pose a significant global health challenge, necessitating innovative control strategies.
  • Current vector control methods require complementary tools, with a growing interest in modifying vector behavior.
  • Spatial repellents, which affect insect behavior, are an under-explored area in public health vector control.

Purpose of the Study:

  • To evaluate the public health benefits of spatial repellents at sublethal doses.
  • To propose novel evaluation methods for public-use insecticides.
  • To identify critical factors for adopting spatial repellents as supplementary vector control tools.

Main Methods:

  • Field experiments assessed the effects of transfluthrin, a pyrethroid insecticide, on Aedes albopictus mosquitoes.
  • Human protection levels were measured in one experiment.
  • Mosquito knockdown and mortality rates were assessed in a separate experiment.

Main Results:

  • High levels of human protection (>80%) were maintained for 5 hours, even when mosquito mortality dropped to zero after 1 hour.
  • The choice of evaluation parameter significantly impacts study outcomes.
  • Sublethal doses of spatial repellents demonstrated efficacy in protecting human hosts.

Conclusions:

  • Spatial repellents can provide substantial human protection at sublethal doses, offering a promising public health intervention.
  • Evaluation metrics for vector control tools should prioritize human protection alongside insect mortality.
  • Further research is needed to address key issues before widespread adoption of spatial repellents.