Interesting facts on VAMPIRES

They all hate canines. They don't have any digestive system past the stomach. They all have the same blood type, labeled O-V. They can be brought back to life with massive blood transfusions.

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that depends on what you define as interesting

• Vampires can be out in and active in day-light although their powers are diminished. Count Dracula did as much. The Nocturnal restrictions of Vampires has been much exaggerated.
• Dhampir is the child of a vampire father and a human mother. They are said to have the powers of a vampire and none of their weaknesses. This is actually an old slavic belief, not a modernistic spin-off. The legend of the Dhampir may actually precede that of vampires. Vampire being Dhampirs that come back to life, reinanimated by that special something that was part of their 'human' linage.
• Vampires are in every culture in some form. The ability to take 'life energy' being the unifying theme. Blood-sucking is merely the slavic variation on the theme.

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Vampire can go out in the day yes, but many choose not to. (They DO NOT sparkle! Stephenie Meyer admitted she made that part up! I'm sick of people asking me this.)
Dhampirs rarely have powers. And many illegitimate children were said to be dhampirs to spare the whorish mother's blushes. I remember many incidents of such cases a few centuries ago where, when further investigated, they were either just illegitimate bastards or weaklings from being an actual Dhampir but not feeding. Dhampirs were usually put down for that reason, and they could rarely manage their nature at a time when hiding what you were was necessary. Dhampirs do not precede vampires. Not only does that make NO sense (how may a child precede its parent?) but it just isn't true.
Vampires can reincarnate but many do not see a purpose to another life of pain and unhappiness. Yet some fear the afterlife so do reincarnate.
Blood has been important in all cultures e.g. Kali in India, Sekhmet in Egypt, Christ's blood in Christianity. It is regarded as a life-giver, hence the term lifeblood.
Life is important in all cultures, and religions, as is the ideas of death and an afterlife.
Vampires do not sparkle. Just to clarify once more.
Their eyes may change colour, but this is according to mood. Skin may change in tone according to hunger though.
And some vampires have odd, scientifically-validated, biological abnormalities e.g. I know one who has an elastic quality about him, so when he got hit by a car this one time he was unscathed, he was already fine by the time it stopped.

All born vampires are born O-V type, which means they are classified as half-blooded, because all vampires have human blood. Pure bloods are vampires that are under 10% human, making them the most powerful of the lot. They are very rare. In order for a half-blood to become full blooded, it must perform the Spilling.
The Spilling is where a vampire takes the lifeblood of a human that trusts the vampire completely. If half bloods do this, they will immediately become full blooded, therefore changing and remaking their physical appearance and strengths.
In order for a human, to become a vampire, he/she must be bitten by a full-blood and not be killed. Then the 'newborn' vampire will be classified as a tainted blood.

Quick note: According to the book Dracula which started the first vampire craze in western Europe vampires that have been bitten must serve who ever bit them like a butler might.

In Judaism, in the light of the Torah, it was believed that blood was the container for the soul, it was that which fed the soul, nourished it and kept it alive. For this reason the consumption of blood is prohibited.

Christianity too is inescapably blood based. Old Testament writers describe blood sacrifices in painstaking details and their New Testament counterparts layer those symbols with theological meanings.

The word "blood" occurs three times as often as the "cross" of Christ, five times as frequently as "death." And daily or weekly, we commemorate Christ's death with a ceremony based on his blood.

From a biblical perspective, as noted by Stephen Peele (The Blood of the Covenant, 2003):

 "Blood to the believer is like oil to an engine, neither can survive without it".

Blood is understood as an appeasement to God, first exemplified in the Garden of Eden by his slaughter of two animals to cover the sins of Adam and Eve. Peele argues, with detailed scriptural evidence, that the significance and power of the blood shed by Jesus is demonstrated from eight perspectives:

• redemption
• propitiating
• cleansing
• forgiveness
• access to God
• justification
• sanctification
• commemorative celebration