more serious Vampire worlds are bound to have figured these things out. Vampire the masquerade perhaps? (the rpg) Or Anne Rice in her books? Buffy and Angel are really loosely connected to scientific explanations, and Joss Whedon was glad he had invented a Hellmouth to blame all things irrational on.

I admire your dilligence though!!!

clan of vampires sounds about right, I agree with stretfordditto.

kiss