Duluth, MN (KDAL) - In an attempt to halt the spread of C-W-D, the Wisconsin D-N-R will be conducting aerial surveys for deer in the Shell Lake area in Washburn County. The Department of Natural Resources says their goal is to estimate the deer population in a 36-square-mile area surrounding the spot where a deer tested positive for Chronic Wasting Disease in 2011. High concentrations of deer increase the risk of spreading the disease. C-W-D is a contagious and fatal neurological condition that affects deer, elk and moose. In related news, C-W-D testing on three deer, which were either sickly looking or acting abnormally, came back negative. The surveys will be conducted, weather permitting, in February and March.