The link is not 100% but two hunters eating from the same deer population and falling ill at around the same time is extremely unlikely to be a coincidence.
We are essentially one mutation away from this spreading between humans and that would be very, very bad.
With so many possibilities of deer and cattle coming into contact in rural settings, I especially worry about my relatives that have cattle and occasionally hunt. I guess my mother had a point about never wanting to try any venison that they cooked.