Kate's got special blood. It has a dormant strain of Immortuus in it, which is the pathogen that creates vampires in her world.
It grants her an immunity to sickness since it chomps up viruses for breakfast, and makes her immune to both vampirism and lyncanthropy. Under certain circumstances it can be used to cure others.
Re: Superhuman Physical Attributes
It grants her an immunity to sickness since it chomps up viruses for breakfast, and makes her immune to both vampirism and lyncanthropy. Under certain circumstances it can be used to cure others.