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In reply to the discussion: The Walking Dead - 18 Miles (spoilers) [View all]racaulk
(11,550 posts)This point was addressed in the graphic novel series on which the TV series is based.
Highlight the white text below if you want to know more (potential spoiler!)...
[font color="white"]In the graphic novel series -- After leaving Hershel's farm, the group move into a prison where they stay for a while. While there, someone (a character not yet introduced in the TV series) is killed by gunshot and later reanimates as a zombie. Rick then makes the connection that any dead person will come back as a zombie, not just those that are infected by existing zombies.
For the TV series, I bet this is the secret that the scientist at the CDC told Rick. And since no one has died of natural causes since their visit at the CDC, he hasn't had to tell the group this news. This is why he shot the guy in the bar in the head after he was already dead and why he was so disinterested in examining the bodies of the dead cops with Shane -- he kinda shrugged off and dismissed Shane's observation about lack of bite marks.[/font]
But then again, the TV series is deviating somewhat from the graphic novel series, so who knows?