There ahve been a few changes to the zombie mutation today. Here's a list.
1. Feeding: Feeding is now an interruptable act. Also, you must decapitate the head before feeding from it. If you try to feed from a corpse instead of a head, it automatically queues a butcher action to take the head. Zombie claws are as effective as a butcher knife, so you shouldn't have to many issues.
2. Zombies now respawn in prison if they have stars. This includes panopticon and the cube. You will spawn in a special room in panopticon, and get a cortex bomb.
3. Police and security guards will decapitate zombies. We can't have you criminals circumventing the system with you spooky voodoo, after all!