WI has the big CWD problem due to years of uncontrolled hunting over massive bait piles. The animals would congregate over truckloads of corn, apples and anything else the hunters would supply, in order to guarantee a hefty harvest of venison.
Hundreds of animals would stand and feed and urinate and defecate in the same controlled areas.....spreading all kinds of nasty stuff....
First, baiting is still legal in well over half the state. Probably 3/4 geographically.
Hundreds of deer, over bait piles, you must be kidding. You were probably looking at an agricultural site.
Unine and defication, sounds gross, but the speculation is that it's passed by nose contact, perhaps dripped mucus, but it's only speculation. From imported deer I'll note.
It was a great panic 6 or 7 years ago, which the DNR lightened up on when it saw what it did to license sales. But not that big a deal, and I seriously doubt baiting played any role. Else it wouldn't be legal.