Like many others, I'm currently performing haphazard and semi-reckless vampire science.
While scrolling through levels I happened to pass one of the bedroom floors and a little flash caught my eye. I noticed one of my new miners was flashing yellow and a recently immigrated mechanic was standing over him. Curious, as this was my first vampire, I watches as the flashing slowly increased in speed and went from yellow to red, as it would if he was bleeding out... which he was. Finally I created a burrow in the room and assigned a random dorf to it to see if they'd catch the vamp. Sadly they arrived about 2 seconds after the miner died. The miner was immediately carried to the corpse pile. Next season when I got around to building coffins, people suddenly announced he was found drained of blood. After a full season of people walking by the stockpile.
The guilty vampire, having managed not to be seen, is now happily residing in my jail, burrowed, behind a locked door along with the miner that just arrived claiming to be 43 and a former resident of 15 forts. I feel bad about the mechanic though. He arrived on the map as a woodcrafter and had a mood before he even reached the fort.. made a nice little table. He didn't gain the experience from the mood though.
Now I'm curious to see if the vamps will A: stay in their burrow, B: break down the locked door or maybe even C: try to feed on each other if they get hungry enough. Personally I'm hoping they will try to feed on each other. If not.. then they can have migrants. 70% of my migrant waves seem to be kids and over half of the adults are fishers. I have managed to safely tap my volcano easily without all the building doors or floodgates I've seen people talking about. This fort shall be fun.