Mapping Toxoplasmosis Outbreaks in British Columbia
Author Information
Author(s): Steven B. Eng, Denise H. Werker, Arlene S. King, Stephen A. Marion, Alison Bell, Judith L. Issac-Renton, G. Stewart Irwin, William R. Bowie
Primary Institution: Capital Regional District Health Department
Hypothesis
Is the municipal water supply associated with the outbreak of toxoplasmosis?
Conclusion
The study found that the incidence of Toxoplasma gondii infections was significantly higher among residents served by a specific water distribution system.
Supporting Evidence
- 83 out of 94 acute cases lived in the area served by the Humpback Reservoir.
- The incidence rate of acute infection was more than three times higher for those served by the Humpback Reservoir.
- 36 out of 3,812 screened pregnant women were classified as having acute infection.
Takeaway
This study used maps to show that more people got sick from a water source in British Columbia, helping to find out where the problem was.
Methodology
Computer-generated dot maps were used to analyze the geographic distribution of Toxoplasma gondii infections and data from a serologic screening program.
Potential Biases
Potential for misclassifying exposure due to reliance on the Medical Services Plan database.
Limitations
Rates were not adjusted for age or other covariates in the geographic mapping analysis.
Participant Demographics
The study involved residents of the Capital Regional District, including 3,812 pregnant women screened for T. gondii infection.
Statistical Information
P-Value
0.0003
Confidence Interval
95% CI: 1.88-6.63
Statistical Significance
p = 0.0003
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