The problem with D&D; is that it's a collection of campaign settings that have different presentations of vampires, and even the Monster Manual vampires are subject to change from edition to edition. Including D&D; would be a massive venture, unless you wanted to greatly limit what's considered D&D;'s version of a vampire. But presenting Ravenloft on its own would be fair, because Ravenloft is, at its core, vampire lore.