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Does targeting key-containers effectively reduce Aedes aegypti population density?

Rafael Maciel-de-Freitas¹, Ricardo Lourenço-de-Oliveira

¹Laboratório de Transmissores de Hematozoários, Instituto Oswaldo Cruz, Rio de Janeiro, Brazil. freitas@ioc.fiocruz.br

Tropical Medicine & International Health : TM & IH

|May 25, 2011

Summary

Targeting large water storage containers like water tanks and metal drums effectively reduces adult Aedes aegypti mosquito populations, crucial for dengue fever control.

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Area of Science:

Vector control
Medical entomology
Public health

Background:

Aedes aegypti mosquito control is vital for preventing arboviral diseases like dengue.
Eliminating breeding sites is a primary strategy to manage vector populations.

Purpose of the Study:

To evaluate the effectiveness of targeting specific, highly productive Aedes aegypti breeding containers.
To assess the impact on adult female Aedes aegypti density and overall infestation levels.

Main Methods:

Weekly monitoring of adult female Aedes aegypti populations over 55 weeks.
Periodic pupal surveys to identify the most productive container types (water tanks, metal drums).
Intervention involved covering identified productive containers with nylon nets.

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Main Results:

Water tanks and metal drums were identified as the most productive breeding sites.
Covering water tanks alone caused a short-term reduction in mosquito density.
A sustained decrease in adult female Aedes aegypti density was achieved by covering both water tanks and metal drums.
Pupal abundance and infestation levels decreased significantly after targeting these key containers.

Conclusions:

Targeting the most productive container types, specifically water tanks and metal drums, is an effective strategy for reducing Aedes aegypti populations.
This targeted approach supports its role as a valuable tool for dengue fever control.
The combined intervention on these large, perennial water storage containers yielded long-term population reduction.