This seems like kind of a tunnel vision outlook from knowing one particular bit of trivia.

Have you heard of bovine tuberculosis?

https://en.wikipedia.org/wiki/Mycobacterium_bovis

The reason it comes to mind is not because I've ever been near a farm, but I was just reading a collection of letters by a writer in the late 1940s, who had a small farm on an island. He was dying very slowly of tuberculosis (it seems implied people didn't distinguish between regular TB and bovine) and he mentions wanting to get a cow, but one that's been tested for TB to make sure his son doesn't get sick like him. Because humans can and do catch it from cows.

There's also

https://en.wikipedia.org/wiki/Brucellosis

which you get from unpasteurized milk. Our ancestors had a lot of experiences that are obscure now.