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This is a cow with the disease called Johne's disease:
This is a Bufallo with the same disease:
Here is a goat with the same disease:
You can see the animal is losing weight rapidly, those animals will simply die.
It has been found in primates and other animals too.
Now for the kicker, this bacteria called (Mycobacterium avium subspecies paratuberculosis) is in a huge percentage of the milk supply right now, if you go into any store right now, a biologist will be able to find a box of milk with it in it. Here are some numbers for you:
So what disease is linked to this in humans, crohn's disease: