Symbiotic viruses: A shower thought about squirrels led to https://www.nature.com/articles/nrmicro2491 Sorry, you may need to hunt for it on scihub if no login. Viruses are not always the enemy
tldr; goes in to the way viruses can benefit their hosts. This ranges from full symbiosis, to competition within a species. i.e ‘Guns, Germs and Steel’ without the guns and steel.
