User blog comment:GSFB/Orcs vs Zombies/@comment-2136224-20130108220740/@comment-5232784-20130111010637

That's true: In the Brooksian Zombieverse, only humans become Zombies when infected with Solanum (zombie virus): however, the same virus wont turn animals into undead monsters, it will kill them; that's why in the Brookian mythos even hyenas and flies won't touch Zombies, let alone eat them. Hyeans and other animals wont bite them unless in self defense. However, this is not universal in Zombie movies and books.

Orcs are as different from humans as any star trek alien humanoid: for all intents and purposes they are alien, biologically speaking. So although the zombie virus may be capable of infecting them, it very likely won't.

BTW: don't worry about the ending for Vampires vs Zombies: I have a different idea in mind...