Interesting ... Typhoid Mary.

via Neptunus Lex from the Mail Online...

TYPHOID MARY, THE WOMAN WHO MADE MEDICAL HISTORY

Mary Mallon (above, right) was the most infamous patient at North Brother Island where she spent nearly three decades of her life.
Despite being healthy, she was a carrier of the typhoid virus  – and is believed to have been responsible for 43 infections and three deaths.
‘Typhoid’ Mary, an Irish immigrant who emigrated to the U.S. in 1884, worked as a cook from 1900 to 1907.
She was first identified as a carrier by medical researcher George Soper, who concluded she was responsible for a spate of infections linked to where she lived and worked.
But she refused to listen to him. Instead, the city intervened after Soper published his findings, and his subject was forcibly incarcerated on North Brother from 1907 to 1910.
Typhoid Mary fought for three years to be released, claiming she was being persecuted by the authorities.
She was finally set free on the proviso she would stop working as a cook.
But Mary Mallon promptly changed her name and broke her pledge, leading to her return to the island in 1915.
She was to stay there, living in her own cottage, until her death in 1938.
When doctors carried out a post-mortem, they found live typhoid cultures in her body.

I just found this interesting.