Originally Posted by blaise
It seems like the zombies are decomposing, so I would think if you could wait them out for a few years they would start just breaking down to the point of being immobile.
Right. Unless anytime someone dies, bitten by a zombie or not, they turn into a zombie. That would make for a situation where there are constantly fresh zombies (though the living population is so depleted at this point, there will be far fewer than at the outbreak). They also said that explains why some zombies are more mobile and aggressive. The more decomposed ones are the crawlers and such. The fresher ones are the ones that can move pretty quick and swarm.