Disease is known as the silent killer. But how do you stop a silent killer when you don't know who the carrier is? Let's travel back in time to the turn of the 19th century and discover how one person caused illness all over New York.Sources:https://charleyproject.org/case/courtney-corrinna-holdenhttps://www.ncbi.nlm.nih.gov/pmc/articles/PMC3959940/https://www.merriam-webster.com/dictionary/binomial%20nomenclaturehttps://www.ncbi.nlm.nih.gov/books/NBK519002/https://medbroadcast.com/condition/getcondition/typhoid#:~:text=The%20main%20way%20typhoid%20kills,into%20the%20bloodstream%2C%20causing%20bacteremia.https://www.history.com/news/when-america-despised-the-irish-the-19th-centurys-refugee-crisis