Whoever is bitten by a werewolf and lives becomes a werewolf himself.
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You didn't plan on becoming the Wolfman. After all, you were just wandering around the woods one night minding your own business when a strange looking dog bites you a little and suddenly you're turning into a hairy creature with pointy teeth and a thirst for blood. Luckily, you only have to worry about blacking out and mutilating livestock when there's a full moon, although your new silver allergy may make your next fancy dinner party a little awkward.