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The distribution of CWD in the US in 2005 (A), 2010 (B) and 2017 (C) and area of the 28 contiguous states east of the Mississippi River spanning ~ 2.5 M km2 (within the red line) selected for comparison. Maps produced by and courtesy of the US Geological Survey's National Wildlife Health Center (https://www.nwhc.usgs.gov/disease_information/chronic_wasting_disease/)
