Zombies as you've never seen them before. None of your crawlers, pukers or exploders. Instead, exaggerated versions of their old human selves, but with 20% of traits now coming from their biter. Which explains why it's not unusual to find a zombie listening to Crass one minute and Phil Collins the next.
Having realized the advantages of being a zombie, humans fight to be infected. After all, who could turn down the chance of eternal life...