*Illinois, Wisconsin locations as of April 19 Lafayette Source: Wisconsin Dept. of Natural Resources CWD cases in Wisconsin and Illinois Here are the locations of the majority of confirmed chronic wasting disease cases in the two-state northern Illinois and southern Wisconsin region. WISCONSIN ILLINOIS LaSalle GATEHOUSE MEDIA CWD Cumulative Positive Location County Boundary CWD Affected County Rock Green Walworth Kenosha Waukesha Iowa Grant Dane Richland Sauk Columbia Jo Daviess Stephenson Winnebago Boone McHenry Lake Ogle DeKalb Kane Kendall Grundy DuPage