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. 2017 May 31;125(5):057008. doi: 10.1289/EHP57

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EHP is an open-access journal published with support from the National Institute of Environmental Health Sciences, National Institutes of Health. All content is public domain unless otherwise noted.

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Grid map of Northings (y-axis) and Eastings (x-axis) showing the regions where at least one tick and where no tick was found according to the surveillance conducted 2003–2012. The second grid map of Northings (y-axis) and Eastings (x-axis) plots the R0 estimates for the period 1971–2000. — Top: Data from active tick surveillance conducted between both 2003–2012 (Bouchard et al. 2015) and 2008–2013 (Ogden et al. 2014a). Locations where at least one I. scapularis tick has been found are marked by red triangles. White triangles mark locations where no I. scapularis ticks were collected. Bottom: Historical multimodel mean $R_{0}$ estimates for the period 1971–2000. The $R_{0}$ bar provides a color gradient showing the colors, which correspond to specific $R_{0}$ values. The numbers around both the top and bottom maps depict the northings and eastings associated with the domain.