Twlight Fans please answer this for me:

Not sure if anyone is a twilight fan on bolt. I just don't understand some basic facts about vampires in general so I'm asking these question so I learn more about the movie.

Why don't vampires have blood banks so they can keep sucking the blood from multiple victims, after all it's the human blood they want right?

If a human gets bitten they turn in to a vampire. If a person gets injected with a needle they don't turn in a vampire.  (So a vampire could keep drinking blood from multiple victims if without ever risking running out of blood ever again.) 

Found at: http://www.seventeen.com/entertainment/features/vampire-facts-from-...

FACT: Vampires only need to feed twice a month to keep their thirst under control.

http://www.thefrisky.com/post/246-twilight-terms-and-miscellaneous-...

This takes in to account the vampire isn't an uncivilized vampire.

Uncivilized vampires: Vampires that consume human blood and are more animalistic, wild and uncontrolled. They’re described as walking as if they’re “on the edge of shifting into a crouch” to attack.

What happens if person has Aids, hepatitis B or hepatitis A? Do vampires get very sick or die? How are other ways vampires get sick beside from not drinking enough blood? It's said they do throw-up human food if they have to eat it.