There is no official answer atm but what do you think anyway. How did it start, what caused it?
Trivia (of the linked page). - "In the Webisodes, it is rumored that terrorists caused the "infection." This is most likely not true, as Kirkman himself never intended to explain the source of the outbreak."
Do you think they will ever reveal how the zombie pathogen was caused and how it spread?
You think the Zombies will all die off?
Oh and check the FAQ in the link for valuable answers for questions which are frequently posted. They are answered by the authors/directors themselves.
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Edited by Helljumper 141: 10/28/2013 2:52:09 PMIt probably mutated, if its airborne then there could've been an accident while finding a cure. Which means there could still be some remnants of civilization left. I mean one small town survived, how many other towns survived and possibly banded together? A result could be some surviving scientists trying to find a cure and accidentally releasing a mutation.