Do you read lore? No. Back up your claim. Period.
Fair enough. I agree that the case of Morvath is somewhat confusing and opens up for this discussion, but still. The vampirism in Skyrim and Oblivion have different names, very different effects and in my opinion different appearances (but that could be wrong or just difference in graphics). So why would Beth change all these effects AND the name? Don't say they changed the name just for gameplay purposes... And just to add that, we know there are different types of vampirism as well.
And as for Morvath, wasn't he a vampire before the things that happened in Immortal blood? These sentences in the book at least hints of it:
"I came to learn that Movarth Piquine could see in the dark almost as well as the light - an excellent talent, considering his interests were exclusively nocturnal."
"One of my acolytes brought him to me, and from the look of him, I at first thought he was in need of healing. He was pale to the point of opalescence with a face that looked like it had once been very handsome before some unspeakable suffering. The dark circles under his eyes bespoke exhaustion, but the eyes themselves were alert, intense, almost insane."
And of course:
"Vampirism," he said, and then paused at my quizzical look. "I was told that you were someone I should seek out for help understanding it."
"Who told you that?" I asked with a smile.
"Tissina Gray."
I immediately remembered her. A brave, beautiful knight who had needed my assistance separating fact from fiction on the subject of the vampire. It had been two years, and I had never heard whether my advice had proved effective.
"You've spoken to her? How is her ladyship?" I asked.
"Dead," Movarth replied coldly, and then, responding to my shock, he added to perhaps soften the blow. "She said your advice was invaluable, at least for the one vampire. When last I talked to her, she was tracking another. It killed her."
Maybe he was the one who killed her?
And at the end of the book:
"He did not land the first blow or the last."
And btw, I do read lore.