In my oppinion, it is all about probability. Less exposure less chance, more exposure the higher the chance. I had Tulerimia which was sure enough an eye opener for me, I was as strong and healthy as I'd ever been when I got it, I was circling the drain there for a few days, at my age now it would likely kill me. My hunting buddy got a Tape Worm, no idea how. I've gutted animals before and found some strange stuff, like live parasites (worms) crawling through the flesh, damaged and discolored organs.
I have a buddy who is a professional butcher, he does a lot of wild game. He is also one of the smartest and most knowledgable people I know. He taught me to respect the process and not get lazy about handling wild game. He advised me around Fox and Yotes it is better to wear a dust mask, some parasite eggs go airborne from dried feces stuck to the fur.