Quote:
Originally Posted by Lilybeans
No. I doubt it has anything to do with farming.
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Why would you doubt that? It's pretty self-explaining how in a given groups of animals a sickness is transfered from one to another. This isn't even any different from how a flu spreads among humans. However, the key factor there is the group size rather than the size of the quarters.
It is also widely accepted that factory farming can facilitate all kinds of mutations of germs and even the creation of new diseases, i.e. by enabling or at least alleviating the interspecies transfer of pathogens. Again, this is not very different from the civilatory diseases found among humans.