Effectiveness of Aerial Spraying Against West Nile Virus in California
Author Information
Author(s): Carney Ryan M., Husted Stan, Jean Cynthia, Glaser Carol, Kramer Vicki
Primary Institution: California Department of Public Health
Hypothesis
Does aerial spraying of mosquito adulticide reduce the incidence of West Nile virus infections in humans?
Conclusion
Aerial spraying effectively reduced the incidence of human infections from West Nile virus in treated areas compared to untreated areas.
Supporting Evidence
- Aerial spraying reduced the number of human West Nile virus cases in treated areas.
- No new cases were reported in treated areas after spraying.
- 18 new cases were reported in the untreated area during the same period.
- The odds of infection were approximately 6 times higher in untreated areas compared to treated areas.
Takeaway
Spraying insecticide from the air helped stop people from getting sick from a virus spread by mosquitoes.
Methodology
The study compared human West Nile virus cases in treated and untreated areas before and after aerial adulticiding.
Potential Biases
Assumptions about the homogeneity of populations in treated and untreated areas may introduce bias.
Limitations
The study did not account for potential mosquito infiltration from untreated areas post-spraying.
Participant Demographics
The study focused on human cases in Sacramento County, California, during the 2005 West Nile virus outbreak.
Statistical Information
P-Value
p<0.0001
Confidence Interval
95% CI 2.400–12.16
Statistical Significance
p<0.0001
Digital Object Identifier (DOI)
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