Vampires, zombies, and werewolves have all appeared in a variety of cultures and legends, as well as an inordinate number of horror stories, novels, TV shows, and films. But there are potential scientific explanations for these creatures of the horror genre.
While there are a few potential explanations for vampirism, the one that seems to match the most traits of vampires is porphyria. It can cause sensitivity to light and dislike of foods, like garlic, that are high in sulphur content. Zombie explanations often involve viruses or bacterias, a trait shared with fictional zombies. And werewolves might also be explained by porphyria or congenital hypertrichosis universalis or rabies.
You can read more about these theories here!
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