"but I'm immunised against lycanthropy"
Lithographie de la Légende rustique de George Sand, 1858
Public DomainLithographie de la Légende rustique de George Sand, 1858 - Credit: Paris, bibli.des Arts décoratifs

Lycanthropy is the professed ability of a human to transform into a werewolf, or gain wolf-like characteristics. It derives from the Greek words lykos (wolf) and ànthrōpos (human). 

In medical terms, clinical lycanthropy describes a medical condition in which a patient believes he or she is, or has transformed into, an animal and behaves accordingly