This article is from the Vampires FAQ, by BJ Kuehl bj@alpha1.csd.uwm.edu with numerous contributions by others.
Sure. Theorizing about the origin of the vampire is a hot topic here
and one which often results in some interesting discussions. Just be
sure to phrase it in terms of a "theory". If you present it as a "truth",
and claim to have proof, you will probably be asked to provide it--
a situation which can lead to some wicked debates. Here is a sampler of
some theories that have been discussed in the past.
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 INTERDIMENSIONAL THEORY:
Vampires are interdimensional travellers 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)]
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]
 
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