[quote=@Witch Cat]
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Well, depends. In some cases, the trait is just recessive. The bite won't affect the target at all, and will just turn them into a minion. However, if the trait is co-dominant, the bite will "shock" the trait into overriding the other, which makes the trait dominant and turns the target into a vampire. Due to this sudden change in your gene, many changes are noticed. Pale skin, high metabolism, etc.
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I just like the idea of hyper violent vampire cells, more than DNA shit. I think the disease thing is more plausible and flexible when it comes to the story.