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I bet you 10-to-1 that the kid who dropped dead died from the Zombie Virus that makes them all turn into Walkers when they die. My guess is that:

1) Unlike Rick and the rest, he was uninfected.
2) He became infected when he came into contact with Daryl's saliva.
3) The zombie virus kills most people that it comes into contact with.

Part C has actually been my theory from the start, because there's no way the Zombie Apocalypse could've happened if all the virus did was turn people into Walkers when they died for whatever reason. Not enough people die every day to produce enough Walkers to obliterate civilization. The virus had to have killed people, too, and fast, for civilization to have become overwhelmed so quickly without anyone really knowing what was going on or how it happened.

Given that this kid dropped dead less than 12 hours after getting sick and IMMEDIATELY came back as a Walker, that explains how the apocalypse went down. The virus spreads, a large chunk of the population is killed off by the virus within hours of infection and they immediately come back as Walkers. That would produce more than enough zombies to obliterate civilization in a short amount of time without anyone really understanding how it happened.