Water Use Practices Limit Aedes aegypti Control
Author Information
Author(s): Garelli Fernando M., Espinosa Manuel O., Weinberg Diego, Trinelli María A., Gürtler Ricardo E.
Primary Institution: Laboratorio de Eco-Epidemiología, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Buenos Aires, Argentina
Hypothesis
What factors limit the effectiveness of a temephos-based Aedes aegypti larval control program in Northern Argentina?
Conclusion
The study found that the residual effects of temephos were much shorter and more variable than expected, primarily due to fast water turnover from household practices.
Supporting Evidence
- Temephos applied with spoons had a median residual effect of 2.4 weeks.
- Temephos applied with zip-lock bags had a median residual effect of 3.4 weeks.
- Water type and turnover were significantly associated with larval mortality.
- Containers with piped water had high turnover rates and shorter residual effects.
- Infestation reappeared on average nine weeks post-treatment.
Takeaway
This study shows that how people use water in their homes can make it harder to control mosquito populations that spread diseases like dengue.
Methodology
The study involved two longitudinal trials assessing the larvicidal effects of temephos in large water-holding tanks, with water samples collected for bioassays.
Potential Biases
Potential bias from householders' awareness and actions to eliminate larvae during frequent visits.
Limitations
The study's bioassays measured larval survival but did not assess adult production, which is crucial for understanding transmission risk.
Participant Demographics
The study was conducted in Clorinda, a city in northern Argentina with nearly 50,000 inhabitants.
Statistical Information
P-Value
p<0.001
Confidence Interval
CI, 46–100%
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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