This plugin, as a master file, attempts to correct oversights within Oblivion by allowing NPCs to catch the dreaded disease Porphyric Hemophilia. In essence, NPCs may now become infected and become Vampires.  As its function solely handles transmission, it doesn't handle NPC behavior nor includes companion-styled reactions or commands. It also permits the player to drink bottles of Human Blood  to restore his/her more youthful appearance as if having fed directly upon a sleeping victim.