No matter how the virus or parasite was created, an infected person that becomes a zombie will go through stages.

1- A newly infected person still has a complete and functioning body, minus rational thinking. Zombies will probably be able to run and move quickly, but average human behavior will be replaced with violent and swift insanity.

2- After the body dies, which would be because it isn't getting any nutrients or any of the things that an animal needs to live, it will start to decay at the rate of any average dead body. This means that the body and all that it is composed of will slowly die, including muscle tissue, which will result in slower zombies as time goes by.

3- Towards the end, zombies will most likely be almost completely harmless. They will have hardly any muscle and no energy to keep them going. The virus will most likely die soon after, resulting in a finally dead zombie.

I really hope I'm wrong though, because if any threat as serious as a zombie were to come about, I hope they won't be able to run. We would have no chance.

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as long as they had people to eat they wouldnt rot because, if they can see you, hear you, smell you, then surely there immune system would work because to have senses they must have alot of brain function.

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As much as I disagree with the assertion that zombies are dead, I will concede that point for the sake of the following theory:

When you go out into sunlight, the UV rays will cause a sunburn with enough exposure. When human skin is burned, the immune system goes about dealing with the dead, burned cells, and new un-burned cells begin to grow.

Now, since zombies were human, it is reasonable to asume that their cells will recieve similar effects from UV exposure. Also, sinc they are "dead" then the immune system will not go about dealing with the burn, and no new cells will be produced. This esentially means that the burn just gets worse and worse until the burned skin just falls off, and the process continues on the inner tisues. There is also the possibility of infection causeing more damage to the zombies body.

Now, this raises 2 interesting questions:
1. Does the exposure to sunlight result in accelerated cell death and destruction of the zombie's body?
2. Will the possibility of such a situation result in zombies becoming solely nocturnal?

I certainly hope to God that both of those statements are true...if so, then we would be reasonably safe during the daytime.

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The only problem is that, after initial decomposition, rigor mortis looses its effect, and ceases to be a factor after about 3 days.

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I would have to agree with Bundy747, one night you go to bed in a world where the dead stay dead and the universal laws apply, when you wake up the world has gone to hell, not only are the dead are walking, but they want your brains. This would mean that the universal laws we hold onto have gone out the window and need to be replaced by new ones, or better stated we would have to recheck reality to verify.

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