If your speaking of Vampire Hunter D, I take that as a compliment.
Vampire bats to exist in the Mexico area to my knowledge Nightfly. They only exist as bats that suck the blood of small animals like rabbits & I think squirrels.
People consider themseleves vampires I guess because of the fetish for blood as well. Keep in mind, there are few who keep their blood in amber stones after all.
Then again, there is a real disease. I forgot the name of it but I saw it on the original CSI (CSI Las Vegas). The woman who killed a man for his organs that carried the most blood. Because if she didn't get enough blood, she would look much older than she should be.
Her character had a dog that killed a hiker in the woods or something like that. Taking the guy's organs, she put the bloodied organs in a blender along with other stuff. And made a protein shake. If she didn't get the blood, she'd actually age faster or at least look like she did.
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
According to the movie Vampire 2000, Judas Escariot was the man known as Dracula. With White Wolf (makers of VtM), Caine is the first vampire. And according to the world-wide known novel of Bram Stoker's Dracula, Vlad Dracule aka the Jackal is the man himself.