Many of our infectious diseases are the result of living in proximity to animals. For example tetanus. The propoganda is that it is caused by organisms that live in the soil. This is true, but it is not the whole truth. How did those organisms get into the soil? From using animal feces to feed food plants grown in that soil. Anthrax is well-known to have crossed over from sheep. People used to have their sheep in a nearby place, and visit with their sheep every day. At one time people, in some cultures, people even slept with their sheep in the same room.
Smallpox is believed to have crossed over from some rodent i think it was. There are a number of other examples but they are escaping me at the moment. measles. Chicken pox.
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