Well it depends on which vampire lore you are going by. It could do nothing, make you stronger, turn you, or make you sick. It all depends on what story line you are a fan of.
Well, the day after you took it you wouldn't be able to go to school, or see your family again becouse in the night a boy vampire would have come for you to love you, and be with you forever!
I don't think that vampirism should be seen in the same light as aids. They were creatures originally associated with the plague, so you probably would get sick. But to me, unless a vampire bit you with the intent on turning you into what he is, nothing would happen.
It can have beneficial affects a well. People who have been bitten or had their blood sucked by vampires would actually be cured by ingesting the ashes made from the suspected vampires heart (but usually, that ended up killing the person afterwards)
