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

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

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

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um, probably gets destroyed by digestive enzymes. Hey, here's a question for you... Let's 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?

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