Alidar Jarok wrote:
. People didn't turn into zombies because they were bitten, people turned into zombies after being bitten because they were dead.
In the original Night of the Living Dead
, the daughter was dying as a result of a bite she recieved sometime before the Coopers reached the farmhouse.
The 2004 Dawn
remake led us to believe Luda (Andre's pregnant wife) was poisoned / slowly dying on her way to full transformation.
In TWD, Sophia's bite did not appear to be such a bleeder that it was the cause of death. It seems the bite turned her into a walker while she was alive (like Jim).
From all three examples, the implication of a bite is that a victim is actually in some mid-state of death, or "zombie-ism," so to speak while technically alive. So, they do not have to die before the disease has altered whatever brain function triggers typical zombie traits.