OK, since I managed to annoy my idol Cecil Adams by bringing up spaghetti sucking, I might as well bug him again.
In her book, American Vampires, Norine Dresser examines the American obsession with and transformation of the vampire legend from Eastern Europe. She also takes up another topic that she’s peripherally connected with.
A physician named David Dolphin once drew a connection between the symptoms of the disease Porphyria and the traditional traits of the vampire. Dresser was called by the AP reporter who reported the story (she’s a folklorist) to comment on it, and she made some vague offhand remark that was taken by the reporter as confirmation of Dolphin’s thesis. She has been associated with the idea ever since.
Unfortunately, she found out subsequently that (1) Dolphin’s claims don’t hold up at all under scrutiny (e.g. porphyria victims lack hemoglobin, but they don’t intuitively know that they lack it, and it is impossible for them to increase their own hemoglobin through ingesting blood, even if they did know that they lack it), and (2) the porphyria=vampirism theory took on a folkloric life of its own, and made life hell for real-world porphyria victims.
It was bad enough they had a disfiguring disease… But now the most likely place for the average person to read/hear about porphyria was in some version of the Dolphin hypothesis, which equated them with monsters.
People, especially children, with porphyria, were teased and stigmatized because of Dolphin’s theory.
How does Cecil enter into all this?
Cecil once (in the first Straight Dope book) passed along the Dolphin “vampirism=porphyria” theory, at least as a possibility, and it’d be cool to see him correct that in public someday.