I’m kinda find this in a forum. So I just do a cpoy-paste thing…
THE VAMPIRE HORMONE THEORY A genetic complex that is usually dormant becomes activated by a hormone brought in from an external source, i.e., a bite. The genetic complex produces more of the hormone, thereby creating a chain reaction in the victim’s body. The hormone also transforms the victim’s physical form. The new form will be superficially human but with a pair of fangs with poison sacs which can inject the hormone into another victim, should the vampire so choose. [Madman Who is Sane]
THE FALLEN ANGEL THEORY: The first Vampires were Fallen Angels aka “The Watchers”, who were cast out of heaven for bringing sin unto the Earth [Stef Zodiak]. An adjunct to this theory suggests that the first vampires were the offspring of humans and Watchers. When the Children of the Watchers had consumed all of the available food, they turned to mankind and began to eat their flesh and drink their blood.
THE ANGEL OF DEATH THEORY: The Bible says that the fallen angels came to earth and mated with the “daughters of Eve” to create half demon types who terrorized the populous in pre-flood times. God wanted to even the score and sent His loyal angel, the Angel of Death, to mate with a daughter of Eve in order to create vampires to control the demonic offspring of the fallen angels. After the flood, however, the demons were gone and the vampires (who of course survived because they are immortal and can’t drown) had no purpose and began preying on humans. [Sable Siren]
THE VAMPIRE ALLERGEN THEORY: The vampire injects an allergen of some sort. The allergic reaction in the victim transforms him into another vampire. [White Spirit]
THE VAMPIRE POLYMER THEORY: Vampires are the victims of a DNA-like polymer that was created by the decomposition of a dead body many thousands of years ago. The polymer is transmitted to others via a bite to a vein or artery and may have the ability to evolve, like other life on Earth. [Madman who is Sane]
THE REPRODUCTION THEORY: Similar to the Vampire Polymer Theory, but the material passed to the victim is actual DNA, created by a completely different species which uses humans as hosts for a method of asexual reproduction. The human host eventually changes into a member of the vampire species. [Madman Who is Sane]
THE ATLANTIS THEORY: The Atlantans, in their quest to prolong life, were doing genetic experiments, the end result being a new human that could live forever but had to drink the blood of humans in order to survive. [Aziel]
THE INTER-DIMENSIONAL THEORY: Vampires are interdimensional travelers who come to this dimension to feed on humans because their blood source died out long ago in their own dimension. [Aziel]
THE HUMAN PREDATOR THEORY: Humans are destructive to Nature and so Nature, striving for balance, created a humanoid mutation in order to “cull the herd”. Seems fitting that it would be a vampire, since vampires would be able to walk with humans without creating too much notice.
THE VAMPIRE HOMINID THEORY: Vampires are an ancient offshoot from human evolution. They evolved in a barren region, i.e., desert or tundra, so they have high tolerance for the elements but no way to make hunting tools. Consequently, they learned to steal from humans. The vampire’s thirst for blood lies in their need to take as much water as possible from the arid environment in which they evolved. [BJ]
THE ALIEN VAMPIRE THEORY: In 1894, in “The Flowering of the Strange Orchid”, H.G. Wells explored the possibility of space aliens taking over a human body in order to live off the life energy of others. Since then, vampires have become a favorite alien in SciFi. Many theories have issued since, ranging from the purely fantastic to plausable, but all were inspired by the host of SciFi books and movies that portray vampires as space aliens.
THE VAMPIRE NANOBOT THEORY: Nanobots, created by either a) renegade scientists or b) a race of reptilian saurians, were introduced into a handful of human bodies in order to repair cell damage. The Nanobots performed so well that they rendered their hosts immortal. However, the Nanobots themselves are not immortal and must self-replicate by utilizing the iron atoms from the hemoglobin in the host’s red blood cells. The result of this nanoreplication process is the constant need for blood. Unable to keep up with the demand, the host has no choice but to seek blood from another. If the colony of Nanobots exceeds the host’s ability to feed, some Nanobots may migrate into another host, usually the next victim of the primary host’s bite. [LuckyHoodoo9 (a) and klaatu (b)]a
THE SEVEN MAGES THEORY Seven mages made a deal with seven demons many millenia ago. The mages were granted certain powers. In exchange, the demons were able to cross the Veil into this world. They merged with the mages, turning them into vampires. Each time a demon-infested vampire reproduces, a part of the demon passes into the child. [Trinn]
I’m too lazy to translate it, may be later, but not now…