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This question already has an answer here:

If everyone is infected, why are the zombies trying to eat them and not other zombies?

marked as duplicate by phantom42, The Fallen, James Sheridan, Ward, Valorum Feb 16 '14 at 8:22

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They try to eat fresh flesh. Being it infected or not is unimportant.

  • Well, no, because otherwise they would attack each other as well, wouldn't they? – ElendilTheTall Feb 7 '14 at 9:42
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    There's a difference between being "infected" and being a "walker", right? The living's flesh might be infected, but it's still fresh until they die and rise as walkers, at which point the flesh rots rapidly. – Stephan Feb 7 '14 at 9:55
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Everyone is infected, but not everyone has turned. Normal people have a normal scent, that zombies can smell and are attracted to. They don't (or can't) smell the rotten flesh of the people that have turned. That's why zombies only try to eat (fresh) humans and (fresh) animals and not each other.

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