Chelsey

“Can a Jewish vampire drink human blood? On the one hand, the Bible ordains that “ye shall eat neither fat nor blood” (Leviticus 3:17). But on the other hand, the Mishnah teaches that “no law stands in the way of saving lives” (Tosefra Shabat 9:12). However, vampires don’t have lives to save, since the Talmud states that “if one checks the nos¬trils and does not find any breath in them, he is undoubtedly dead” (Seder Moed, Yoma 85 aleph). That being said, a vampire can breathe voluntarily if it so chooses. This would suggest that it does count as a living person after all. That is just a tiny part of the many considerations that would go into a night rabbi’s psikat halacha, or religious ruling, on that particular issue.”
― Uri Kurlianchik, Tales from an Israeli Storyteller