Of course the bacteria live in the intestines of animals, they bacteria live in the ground, and animals spend their whole lives outside eating things off of it. I mean this isn't rocket science here. And of course using the manure from those animals would result in concentrated pockets of the bacterium and its mature spores. That does not mean they are the only source for it. It is in fact, quite widely distributed, in the soil. You don't need animals for it to be present, as your earlier statements quite blatantly state.

I don't care to attempt to convince you of anything personally. That is quite clearly a waste of time.