The New York City health inspector carried out some tests and confirmed that Mary was a carrier. In 1910 she was transferred to an island near New York City, where she lives in isolation for three years. She was then released but told that she should not work with food again. However, in 1915 she took a job as a cook in a hospital and infected ‘25 doctors, nurses, and other hospital staff-two of them died. Mary was then seized again and kept in quarantine for 23 years, living alone in a one-room cottage.