As the Wired piece linked
above points out, beyond the fact that they way we
raise animals on factory farms de facto requires that they be kept pumped full of antibiotics to stave off illness in the dank, cramped, unhealthful, and frankly unethical conditions endemic to such facilities, as antibiotic resistance on farms becomes a greater concern and blame is sought, «the answer has always been that human medicine is equally culpable because it uses similar
volumes of antibiotics.»