Cinema Fiction vs Physics -- Ghosts, Vampires, and Zombies

Interesting article.

Roger Zelazy wrote a short story "Dayblood" in the "Frost and Fire" collection that addressed the vampire population explosion problem. He gives us a creature that feeds on vampires keeping them in check.

I always thought that vampires just killed you by default, or could choose to turn you into a vampire. That would solve the numerical problem with vampires too. Also, people kill them and sometimes they kill each other.