SO everyone has their reasons for the outbreak and the whole epidemic, n I'm gonna say mine is a bit of a crazy theory. Humans are basically a virus that walks the face of the planet, using up every resource until there is nothing left to take. We try to control nature instead of work with it, and I say it's the earth taking itself back. The Dinosaurs went extinct, now it's our turn. In the end every human being will be taken by the zombies and the virus, and the zombies will eventually waste away to nothing.
So what are your virus theories?