The difficulty is that you need anti-biotics for modern mass production of livestock. When you feed cows corn (too acidic for cows) and ground up remains of other cows (cannibalism is unhealthy), keep them in small pens, living in their own manure, that is a hotbed for bacteria. That's why they have to give the meat an ammonia bath in the meat processing plants.<p>The alternative is to grass feed cows, then they don't get sick very often. Of course that takes longer and requires ~1 acre of land per head of cattle, and people don't want to pay ~1.5-2x as much for meat. So we are stuck with the superbugs.