I finally figured out why there are no children werewolves! You have to make bed with one to contract lycanthropy, so it's an STD, which would make sense if you really think about it... if you get bit there's a large chance that you'll contract it through the viral proteins and the like in the saliva when it enters the blood. Hmmm, so much to think about...
So, now you need to make sure of another of those pesky crap diseases...
I don't think vampirism is an STD though, but it's still a blood disease...
So, if you eat a werewolf's or a vampire's flesh then you should contract the disease...
Maybe they're severe prion diseases... That would make it similar then, yes?
I'm betting it's a prion disease though... eh, an STD would be better sounding and would be very funny if one thought about it extensively...