Why vampires never suffers an adverse agglutination reaction even he drinks different blood types

um, probably gets destroyed by digestive enzymes.

Hey, here is a question for you. Let is say there are no vampires in the USA and dracula gets on a boat and comes to New York. If he needs to feed once a month, and each guy he bites turns into a vampire who also needs to feed once a month, then how long before all the people in New York are vampires?

Blood is broken down in the stomach and intestine. .Agglutinatin can not occur.

HUH? are you sure?

but then, you eat the blood from all kinds of animals, with no apparent ill effects.
maybe there is a difference between blood being injected, and going into the intestinal tract.