The Scientific Vampire (The Blood)

Vampires have always been amongst the most popular mythological creatures, from the tales of Bram Stoker to more modern incarnations like those in Buffy the Vampire Slayer and Twilight. However, in case you have been living in a cave and these have all bypassed you, here is a brief overview of the vampire legend: vampires are generally believed to be human beings who, in life, were bitten by another vampire and then return after death to feed on the blood of other humans. Vampires are generally assumed to never die naturally but, depending on which adaptation you read, can be killed by exposure to sunlight, garlic, holy water or direct penetration through the heart with a wooden stake. Vampires are now a pretty popular part of modern culture, but how could the myth have first come about?

Although few scientific papers exist on this topic the internet is rife with debate and appears to point to several different medical conditions:

Probably the most popular theory of the origin of the vampire is the disease porphyria: as explained by this article in Scientific American. Porphyria is actually a term for several diseases which are all caused by irregularities in production of heme, a chemical in blood. Some forms of this condition, such as cutaneous erythropoietic porphyria (CEP), lead to deposition of toxins in the skin. Sufferers are often sensitive to light since light activates these toxins. When active, toxins eat away at the skin causing disfigurement, including erosion of the lips and gums. These factors could have led to the corpse-like, fanged appearance that we associate with vampires and their dislike of sunlight. Interestingly, people who suffer from porphyria also have an intolerance to foods that have a high sulphur content…such as garlic.


Mycobacterium tuberculosis

Another possible explanation for vampires is tuberculosis (TB). This is a lung disease caused by the bacterium Mycobacterium tuberculosis. The reason this disease has been suggested as the origin of the vampire myth is because victims turn very pale, often avoid the sunlight and cough up blood. This is actually due to the disease damaging the lungs, but it’s easy to see how it could be misinterpreted as someone having recently drunk blood. According to this study, the vampire myth may also have arisen from the fact that TB spreads rapidly and easily from person to person. The infectious nature of this disease may have led to the belief that the vampire rises from the dead to feed on his loved ones, causing them to suffer the same symptoms.

An intriguing alternative explanation is Catalepsy. This is a disease of the central nervous system leading to a slowing of the heart and breathing rate, with sufferers often seizing up completely. These symptoms may have led people to mistakenly believe the sufferer to be dead. Therefore, since these individuals were perceived to have risen from the dead, it is easy to see how this disorder could be linked to paranormal mythology