All this has echoes from a hundred years ago and the story of Typhoid Mary. Mary was a carrier of typhoid fever and, employed as a cook, spread the disease to dozens of people. She was quarantined in 1907 and held as a prisoner for three years (when the above picture was probably taken, she was 38 years old). Released on condition that she never again work as a cook, Mary changed her name and continued cooking. In 1915 she was imprisoned for life. She lived as a prisoner for 23 more years, never feeling ill from the disease she carried.
Typhoid is like tuberculosis is one other regard. Typhoid also has virulent, drug resistant strains.