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.
Dark Metamorphosis. Dark Metamorphosis is a healing spell in Castlevania: Symphony of the Night, usable by Alucard from the start of the game. After activating this spell, Alucard will have a red glowing outline around himself and any blood that splashes on him will heal 8HP worth of damage during the duration of the spell's effect.