Vampirification is a complicated process [s]Not really/s]
it starts with being marked, and stalked, then either a kidnapping occurs, or a straight up infection.
The disease is both a Virus, and a Magical curse. the virus causes infected cells to produce minute amounts of dark magic, which in turn fuels the curse, the curse creates virus entities, which propagate the process.
in the first stage, the Disease/curse begins to spread throughout the blood stream, infecting the tissues that compose the cardiovascular system.
Once the entire cardiovascular system has been infected, the Second stage of the infection occurs, where it makes the jump to the Nervous system. in the Nervous system it travels along in Neurotransmitters, and in electro-magical impulses to the brain, once in the brain it prepares it for the push into fully fledged vampiracy
in the third stage, the infection will change the brain slowly, amplifying the sensory input sectors, and affecting the hunger centers, it modifies the peripheral nervous system before the Central, preparing to jump to the Muscular and Skeletal system, around this time, the infected will fall asleep, and they will not wake until the sixth stage is complete.
the fourth and fifth stages are where the infection spreads to the Muscular, and Skeletal systems, making the Skeleton stronger (or weaker if necessary) as well as adding extendable and retractable fangs into the skull and jaw. it also changes the Muscles to accommodate the particular strengths of the Vampire to be.