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We usually perceive vampires as nightmarish, supernatural creatures prone to bloodlust and able to strike terror into the hearts of all who encounter them. Sufferers of a disease called vampire disease, or porphyria to use its real name, may have found in less enlightened times that they were misunderstood or even disbelieved by people associating the condition with the spectres of the night. It seems clear that legends of vampires may well have come from exaggerated accounts of meetings with or glimpses of porphyria victims.