I was told I felt "drained" when I woke up. I don't know if it had any effect on me, but this sounds like "A vampire fed on you" effect if there ever was one.
The good news is that I wasn't co-opted into a cult (although I wouldn't be surprised if this just meant the attack was only partially successful, or maybe I have to be attacked twice, or something).
But this, to me, combined with the fact that there is currently an anti-undead soap being sold right this second, means that Yunalesca, a confirmed vampire, is the biggest threat to the town.