"Zombie" Virus

[lkiam]

I remember in the live Q&A last year a question was asked about the "virus" and if it could mutate. Shane avoided answering but it seems to me like it can. At the beginning of the story, the zombies seemed like the ones in movies, unintelligent and instinct driven, but as the story progressed, they became smarter, and more varied. There were no behemoths, runners, jumpers etc. at the start, so where did they all come from?