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>>5022
>whether a plague, that would cause people to die, and reanimate after, is even possible.
No. However, viruses like rabies infect the brain in such a so a victims 'personality' is gone but the body is still alive.
>I imagine it being a bacteria, that devours brain cells, that makes a person a homo sapiens, and leaves only basic animal instinct to eat.
Basically, rabies...
>Furthermore, the spread of sickness is in question, could it really take over whole world, or even continent, in matter of weeks or so?
A continent in weeks, absolutely. Unless we already have a vaccine, and enough of it. The world in weeks, probably not, it would have to be extremely contagious with a fairly low mortality rate.
>>5028
>What if some weird ass once in a million years global happening, like solar flare radiation or whatever, would activate otherwise not active germ, that has only developed in all living things over past few decades?
If there was, say, a man-made virus, with basically no symptoms, it could be spread very quickly, since no one knows they're infected. If then some 'switch' was flipped, and the infected all suddenly turned 'zombie', there would be streets full of zombies almost instantly. Of course, this would pretty much have to be a man-made, programmable, nano-virus, and that kind of tech is still pretty far off.
>>5029
> Main difference would be that although they might not feel pain, blood loss, trauma to the heart or lungs and other wounds would still result in death and the "zombies" would need to eat, drink and breath in order to keep going.
True. The only exception to this would be the 'Act-of-God' type zombies, actual risen dead. With any type of infection, the 'zombies' still have to follow intake food, water and oxygen. I didn't say 'eat, drink and breath' there because not everything 'eats' and 'drinks' in the way we think of it. Wild cats, for instance, get almost all of their water from their prey.
>>5038
>What if we are talking non-starving entities, that require food only as extra?
Only possible if we're talking about 'Act-of-God' zombies, 'infection' zombies will have to eat and breath to survive.
tl;dr: I've spent way too much time thinking about this...