It's most unlikely you'd encounter a true vampire in the way you encounter living persons. They've been found throughout the history of man, not least of all by myself. On more than one occasion I have been at great risk at the presence of vampires. The first time was in the early 1970s, and a number of times since. In 1990 I was confronted by a predatory wraith or vampire in West Yorkshire while investigating the Kirklees vampire.
Vampires are supernatural.
However they do take a corporeal form. I have personally exorcised quite a number. Precise number I couldn't tell you. But after 33 years of vampire hunting, quite a few. The Highgate Vampire are photos of a vampire soon after exorcism, in the stages of decomposition.