I rarely do myself. I'm not a scientist, and don't analyse or disect these matters scientifically. I am, after all, an exorcist. They do use the Latin rite, but this on its own is insufficient to remedy vampirism. The vampire, by its nature, belongs to the Devil.
Exorcisms require the permission of a bishop in all cases.
Yes, I do believe in werewolfs, and have investigated werewolfism. However, it is not the same as vampirism. One of the most uncanny qualities of the vampire is metamorphosis. The vampire only betrays the blood of those it has nourished itself on. The vampire is otherwise a dead body, reanimated with an awful life.