The MMR vaccine protects against measles, mumps, and rubella (German measles). Many children in the U.S. are immunized as infants and toddlers, but that doesn't guarantee lifetime protection. And not everyone gets vaccinated as a child. Many adults move to the U.S. from countries without immunization programs.
When infected with Lycanthropy, or engaged in Beast Form as a result of Hircine's Ring or completing the Companions questline, persons become fully immune to vampirism. Argonians are naturally resistant to disease, and are 50% less likely than Men or Mer to contract vampirism. PC Disease resistance may fail to prevent vampirism. 2  It is also possible to contract at least one disease (Bone Break Fever) as a vampire, despite vampires being listed as having 100% disease resistance. 3  PC In some cases, becoming a vampire does not grant the Vampire's Sight ability.
An Upir is like a vampire, they both feed on blood. A full Upir is half witch and half demon and a half-Upir is half human, one fourth witch and one fourth demon. If the child of an Upir is born with a caul then they will also become an Upir as well. Stabbed in the Heart: If an Upir is stabbed in the heart then they will be immobilized. 2  Burning: Burning is one of the only things that can kill an Upi. 3  Desiccation: If an Upir is abstained from blood for too long then they will die.