Trial of a community-based intervention to decrease infestation of Aedes aegypti mosquitoes in cement washbasins in...

Area of Science:

• Medical Entomology
• Public Health
• Vector Control

Background:

• Washbasins and metal drums are significant breeding sites for Aedes aegypti mosquitoes in Latin America.
• Manual cleaning methods have proven insufficient for eliminating mosquito larvae in community control programs.

Purpose of the Study:

• To develop and evaluate an improved method for removing mosquito eggs from containers using readily available materials.
• To assess the effectiveness of the modified La Untadita method in controlling Aedes aegypti populations.

Main Methods:

• Developed 'La Untadita,' a five-step cleaning process involving bleach, detergent, scrubbing, and rinsing.
• Conducted a field trial in Honduras, initially with the original method and subsequently with a modified version (increased bleach/detergent, simplified instructions).
• Monitored mosquito larvae/pupae and algae presence in washbasins before and after intervention.

Main Results:

• The initial La Untadita method showed minimal impact on mosquito populations.
• The modified La Untadita method led to significantly fewer algae on washbasin walls, indicating improved cleaning efficacy.
• Intervention neighborhoods using the modified method exhibited significantly lower numbers of pupae and late-instar larvae compared to control areas.

Conclusions:

• The modified La Untadita method demonstrates significant potential for controlling Aedes aegypti infestations in household containers.
• Effective promotion of this community-based intervention can reduce the need for chemical and biological larvicides.
• The method is particularly effective for washbasins in frequent use, offering a cost-effective and acceptable solution for householders.