O.K., now you got me looking again.

http://www.cwd-info.org/index.php/fuseaction/news.detail/ID/eb4941204c49fc2d61bc41f1b80f2f5d

First found in 1967

From the first link, then not only feed piles, but mineral licks could be helping the spread.

But, if it's transmitted by feces, then raised platforms for food and mineral licks could minimize the spread.

I'm guessing that animals build up a resistance to it somehow, or Co. would be barren of cervids.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).