In order to understand origins of viruses and diseases you need to understand wild nature.
Nature kills what there is too much of, it kills what isn’t sustainable for the whole.
When you look at permaculture with a wide diversity of species packed together on a small footprint of land, the diversity itself keeps everything in check.
Nature thrives through diversity.
Diversity in plants automatically explodes diversity of insects and other animals as well. When you allow all of them to exist, then they keep eating eachother and everyone gets a life cycle long enough to reproduce, keeping it all going sustainably and by itself, without interference needed from human beings.
In order to prevent viruses all we need to do as gardeners and farmers is diversify, sow many species of plants that we can use as food and thus medicine.
Let food be thy medicine, eat a diversity of herbs on a daily basis, this then helps our immunesystem deal effortlessly with human viruses as well.
Diversity increases sustainability, fertility, viability, and lifts our mood, keeps us healthy.