The Impact of DDT on Malaria Rates in South America
Author Information
Author(s): Donald R. Roberts, Larry L. Laughlin, Paul Hsheih, Llewellyn J. Legters
Primary Institution: Uniformed Services University of the Health Sciences
Hypothesis
Increased malaria is due to decreased spraying of homes with DDT.
Conclusion
Countries that reduced DDT spraying reported large increases in malaria rates, while Ecuador, which increased DDT use, saw a significant reduction in malaria.
Supporting Evidence
- Countries that discontinued their house-spray programs reported large increases in malaria rates.
- Ecuador, which increased DDT use, is the only country reporting a large reduction in malaria rates since 1993.
- Regression models showed statistically significant negative relationships between APIs and house-spray rates.
Takeaway
When fewer houses are sprayed with DDT, more people get malaria. But when lots of houses are sprayed, fewer people get sick.
Methodology
Regression models were used to analyze the relationship between house-spray rates and malaria incidence over several years.
Potential Biases
Potential bias in data collection methods and reliance on passive case detection.
Limitations
The study relies on historical data, which may not account for all variables affecting malaria rates.
Participant Demographics
Data from multiple malaria-endemic countries in South America, including Brazil, Peru, and Ecuador.
Statistical Information
P-Value
p < 0.0001
Statistical Significance
p < 0.0001
Want to read the original?
Access the complete publication on the publisher's website