Day 22: Where did the SVM/TB vamps come from?

Here's a poser.
What is the mythology of vampires in the Charlaine Harris/Alan Ball universes?
There are several back stories of how vampires came to be in literature and movies that I know, but most authors now make up their own origins for their bloodsucking men and women.
The Fellowship of the Sun I believe go with the Judas myth.
After Judas betrayed Jesus, he hung himself, flinging the 30 pieces of silver on the ground around his hanging corpse. He was not, however, allowed to die, but was forced to walk the earth, sustaining his life by living on the blood of others. His weakness to silver was caused by the "blood money" he was paid to betray Christ. The one thing missing is the fear of the cross.
Still, Harris makes clear that is just what the FOS believes, not how they really came about.
Now, in some stories, a vampire can only be killed by the same kind of tree that Judas used to hang himself.
Anne Rice went even further back to create her vampires. She used Egyptian deities Akasha and Enkil. Now, from what I remember, Enkil was cut into pieces and when he was reassembled, his penis was not found, which is why no male vampire from the Rice universe can have sex.
Now that's a big trade off: you can live forever, but you can never have sex again. Can you see Bill or Eric agreeing to that?
I now must admit I've never read any of the "Twilight" books (I have seen the movies) so I have no idea where those vampires come from either, or why they sparkle in the light.
I only know that "Vampire Diaries" vamps can walk in the sun if they own one of those rings.
As for Vlad the Impaler, aka Count Dracula, take your pick. I go with the story that he drank so much of the blood of those he killed it turned him in some fundamental way, making him both immortal and a creature of the night, hating crosses, garlic and stakes of wood and robbing him of his reflection in mirrors.
As for True Blood and the Southern Vampire Mysteries, I have no idea.
But, since those universes contain all kinds of other supernatural beings as well as us lesser mortals, they can come up with any story they like and it will be just fine.