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Zombies are 'living-dead'. As in neither dead or alive. They don't have to decay in the first place apon coming back. Your point could be carried on the basis of how long they were dead before coming back. So decay can occur, but if decay continues after the 'rebirth', the simple defense agianst zombies would be to wait until there decrepid bodies simple can't sustain itself to the point of scary growls on the floor.
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