The famous symptomless carrier of Typhoid Fever, Mary Mallon, never felt the effects of the fever, but never recovered from a medical system that didn’t know how to treat a carrier of the disease.

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Sources:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3959940/
http://www.mayoclinic.org/diseases-conditions/typhoid-fever/basics/symptoms/con-20028553
http://www.history.com/news/10-things-you-may-not-know-about-typhoid-mary
https://med.stanford.edu/news/all-news/2013/08/scientists-get-a-handle-on-what-made-typhoid-marys-infectious-microbes-tick.html
https://www.britannica.com/biography/Typhoid-Mary
http://www.nydailynews.com/news/justice-story/typhoid-mary-carrier-death-article-1.1398166
http://www.pbs.org/wgbh/nova/body/typhoid-mary-villain-or-victim.html
http://publichealth.lacounty.gov/acd/procs/b73/DiseaseChapters/B73Typhoidfevercarrier.pdf

Images:
https://commons.wikimedia.org/wiki/File%3ATyphoid_carrier_polluting_food_-_a_poster.jpg
https://commons.wikimedia.org/wiki/File:Mary_Mallon_in_hospital.jpg#/media/File:Mary_Mallon_in_hospital.jpg
https://commons.wikimedia.org/wiki/File%3A(King1893NYC)_pg485_SLOANE_MATERNITY_HOSPITAL%2C_TENTH_AVENUE_AND_WEST_59TH_STREET.jpg
https://commons.wikimedia.org/wiki/File%3ATyphoid_fever%3B_its_causation%2C_transmission_and_prevention_(1908)_(14740561216).jpg
https://commons.wikimedia.org/wiki/File%3AOyster-bay-map.gif