Months ago in one of my custom hoods, a vampire went on a biting spree and ended up biting Mrs. Crumplebottom without my knowledge. I had completely forgotten it had even happened since nothing unusua...
I think the crumplefix mod helps to prevent this from happening. http://www.moreawesomethanyou.com/ffs/nl/hacks/
Found more possibilities for you: http://sims.jfade.com/index.php?category=1&subcat=2&skip=20 Scroll down a little for the vampires not biting NPC mods.
I don't know if these were what you have.
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