This my theory. We where attacked by someone or something(aliens, terrorist?). At the very beginning of the story when
Michael is at class there was a huge explosion. Everyone went out to see what the hell happened. I think this explosion happened at
ground zero in LA and there must of been
others all over the world. What was released is unknown but I think it has to be a purpose built virus or a very freaky accident. Everyone around ground zero absorbed the virus and immediately changed into the first stage of "zombie" or just a plain old bitter. This virus will go into the DNA, RNA and unlock all or most of the mutations that the human body has learned to turn off over thousands of years of evolution. The stronger mutated zombies gain strength with time and the mutations have a longer time to develop, so stage two zombie. This zombie has regained some thought control, maybe has a purpose or agenda. The virus must also work with or compound physical and or mental traits of the host. Strong, muscle bounds might turn into behemoths. Maybe the Steroids compound its effect. I think its obvious that the "colored one" or "ink" is the psychopath who they heard about when they watched the news broadcast on the Tivo.
Smart ones and crazy ones just get there smarts and crazies modified to the nth degree.
Once they got a good foot hold over there human predators they would have time to evolve farther, stage three zombie? Who knows what is in store for the survivors in the near future. It can't be good what ever it is.
http://en.wikipedia.org/wiki/Mutation
Reading the above link, makes it all seem so plausible. You just need the right switch.
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