[CatherineofAragon]

"The virus is a nanovirus that creates a teeny tiny thermonuclear reactor in the walker's head. That generates the power the body needs to reanimate, and that's why a stab or blunt trauma to the head deanimates the walker. It destabilizes the microreactor. The reason that a bite kills is that the walker emits nuclear waste via the mouth, which poisons the person.

It's all quite simple and obvious. Really, a little surprised you didn't figure it out for yourself."

See? Thank you. All you have to do is think a little, and it becomes clear.

Don't know why folks worry about the science of it when the answer is right in front of them...

[Lazamataz]

I was going to tell him about how the nanomachines also create tiny hydraulic motors for muscle movement but I didn't think he was ready.

Yet.