As Swamper said, they are certainly concentrated in NE, primarily to the waterways for whitetails. Ranch we hunted last year in western part of state ( Sandhills) was literally cut in half by a highway. Eastside has the Loop River running thru it & 2 irrigated alfalfa circles. West side only has water in tanks and strictly mule deer. The alfalfa would have 100+ whitetails on them each day. You'd think it would be prime incubator for CWD.
BTW, I'm over the whole CWD issue. Have hunted out west since 1979 and no doubt have eaten infected deer & elk.