A lot of people will claim that stories about vampires originate in instances of Jewish ritual murder, but that isn't necessarily true, at least in Eastern Europe. While the kind of vampires popularized by Bram Stoker and F. W. Murnau may seem similar to Jews in some ways (hooked noses, sunken eyes, powers of manipulation, etc), in Eastern Europe (which has historically had many Jews) vampire legends are somewhat different. In contrast to the Western vampire that is essentially a preserved living corpse, in places like Romania vampires are traditionally spirits of the dead who prey on surviving family and friends. While the cadaver is said to retain some living traits (hair and fingernails growing, fresh blood in the veins), the body itself stays in the grave. Stories I have encountered from this part of the world typically involve the spirit strangling the victim to death in a dream. The method for dispatching the vampire is also a little different than one found in Hollywood movies; the heart must be cut out of the corpse, and burned at a crossroads. The victim(s) of this vampire must then drink the ashes mixed with water to be saved. This custom existed in the West as well, and made it as far as North America (in cases like that of Mercy Brown).
Anyways getting back to the point I was originally trying to make, simply saying "vampires = Jews" and leaving it at that is a huge oversimplification of legends and phenomena that have existed for thousands of years.