Actually, CWD is a prion (twisted) that is nearly impossible to neutralize. It is not a living organism in and of itself. It takes excess of 1800 degrees to kill it. Disinfectant won't kill it, chlorox won't kill it. It can be passed on to soil from urine or decaying deer and then transfer in growing plants at the site, so leaving it for coyotes and decay will not stop possible spread through other vectors mentioned.
The best way to deal with an infected carcass is to bury it deep enough as to not be uncovered or in a landfill that will bury it... but not a practical task for most folks.
It is NOT mad cow disease, but is in the family of MCD and Creutchfeld Jacob's disease, which are also misformed prions... one in bovines, the other is found in humans (CJD).
CWD is transmitted from animal to animal contact, ie: touching noses, etc or ingestion.
Blue tongue and other EHD (epizootic hemorrhagic disease) is tansmitted from biting midges. It is theorized that bucks seem to be more susceptible due to the thin skin on developing antlers with easy access to their bloodstream beneath the velvet.