[Blissey]

With the advent of clinics in full-swing, these questions beg an answer:

How is blood type identified for transfusions?

If a Vampire donates blood and the blood is transfused to someone (be it human, another race, etc.), how would the patient react? What if it's somehow blood from six different Vampires? Is there a way for someone to differentiate Vampire blood from regular blood aside from lack of Focus?