I have a buddy who has been preparing Fox pelts for decades (5-6), he hasn't had any issues yet.

Skinning a fox properly isn't easy, it takes some practice.

My best find was a pair of 180 lb. wild sows. Some guy in a hot rod Audi nailed them, they were both DRT.

The last time I looked I found a map with locations and dates. CDC or County Health Department keep pretty good records for stuff like that. Finding them can take some effort.