Typhoid Mary was born with multiple personality disorder, giving her two distinct personalities. Mary is quiet, but Typhoid is a psychotic seductress bent on dominating men by implanting suggestions into their minds.

noun

an acute infectious disease caused by a bacillus [any of several rod-shaped, aerobic bacteria which produce spores] and acquired by ingesting food or water contaminated by excreta [excreted matter, as sweat, urine, feces, etc.]: it was formerly considered a form of typhus and is characterized by fever, intestinal disorders, etc.

Four Horsemen of Apocalypse
Morbius