In order to "KEEP THEM DEAD", you must either blow their brains out using an explosive device (a 12 ga shotgun works nicely) or their heads must be removed from the bodies by 1 of 3 animals.
1. A DOG
2. A HOG
3. A RAT
<img src="/ubbthreads/images/graemlins/doh.gif" alt="" />
In other words, the only thing that works to stop Zombieism is a firearm or a member of the Busse family. Be prepared, be very prepared.