> Case reports of it across Western, Middle Eastern and Asian societies across the last 2 centuries show a remarkable degree of consistency in their reports of this
It should go without saying that a rumor is not a case report. Name one physician who published a report based on extensive first person experience with a vampire (and not, say, Renfield's syndrome).
Plus the case reports are only supplemental to the larger and more empirical lines of evidence for it.
Plus the case reports are only supplemental to the larger and more empirical lines of evidence for it.