Systematic review and meta-analysis of tick-borne disease risk factors in residential yards, neighborhoods, and beyond

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Abstract

Background: Exposure to blacklegged ticks Ixodes scapularis that transmit pathogens is thought to occur peri-domestically. However, the locations where people most frequently encounter infected ticks are not well characterized, leading to mixed messages from public health officials about where risk is highest. Methods: We conducted a systematic review and meta-analysis on spatial risk factors for tick-borne disease and tick bites in eastern North America. We examined three scales: the residential yard, the neighborhood surrounding (but not including) the yard, and outside the neighborhood. Nineteen eligible studies represented 2741 cases of tick-borne illness and 1447 tick bites. Using random effects models, we derived pooled odds ratio (OR) estimates. Results: The meta-analysis revealed significant disease risk factors at the scale of the yard (OR 2.60 95% CI 1.96-3.46), the neighborhood (OR 4.08 95% CI 2.49-6.68), and outside the neighborhood (OR 2.03 95% CI 1.59-2.59). Although significant risk exists at each scale, neighborhood scale risk factors best explained disease exposure. Analysis of variance revealed risk at the neighborhood scale was 57% greater than risk at the yard scale and 101% greater than risk outside the neighborhood. Conclusions: This analysis emphasizes the importance of understanding and reducing tick-borne disease risk at the neighborhood scale. Risk-reducing interventions applied at each scale could be effective, but interventions applied at the neighborhood scale are most likely to protect human health. Trial registration: The study was registered with PROSPERO: CRD42017079169.

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Fischhoff, I. R., Bowden, S. E., Keesing, F., & Ostfeld, R. S. (2019, October 17). Systematic review and meta-analysis of tick-borne disease risk factors in residential yards, neighborhoods, and beyond. BMC Infectious Diseases. BioMed Central Ltd. https://doi.org/10.1186/s12879-019-4484-3

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