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The TropeNamer is the RealLife example of Mary Mallon, the original "[[http://en.wikipedia.org/wiki/Typhoid_Mary Typhoid Mary]]", who spread typhoid fever to at least 53 other people while refusing to believe she carried the disease at all because she [[TheImmune never became sick from it herself]]. In biology/epidemiology, this is known as an "asymptomatic carrier" (i.e., carries the disease but shows no symptoms of it).

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The TropeNamer {{Trope Namer|s}} is the RealLife example of Mary Mallon, the original "[[http://en.wikipedia.org/wiki/Typhoid_Mary Typhoid Mary]]", who spread typhoid fever to at least 53 other people while refusing to believe she carried the disease at all because she [[TheImmune never became sick from it herself]]. In biology/epidemiology, this is known as an "asymptomatic carrier" (i.e., carries the disease but shows no symptoms of it).



* A significant percentage of people who catch [[UsefulNotes/COVID19Pandemic COVID-19]] show few or even no symptoms. Even those who do eventually show severe symptoms will have had a lengthy period of asymptomatic contagion before then. All this leads to a disease that is spread mostly by people who, much like the TropeNamer, feel completely healthy and have no idea they've even been infected -- thus the importance of ''universal'' use of precautions such as mask-wearing, social distancing, and vaccinations simply because ''[[ParanoiaFuel no one can be certain they aren't infectious]]''[[labelnote:*]]'''[[TheFourthWallWillNotProtectYou That includes you]]'''[[/labelnote]].

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* A significant percentage of people who catch [[UsefulNotes/COVID19Pandemic COVID-19]] show few or even no symptoms. Even those who do eventually show severe symptoms will have had a lengthy period of asymptomatic contagion before then. All this leads to a disease that is spread mostly by people who, much like the TropeNamer, {{Trope Namer|s}}, feel completely healthy and have no idea they've even been infected -- thus the importance of ''universal'' use of precautions such as mask-wearing, social distancing, and vaccinations simply because ''[[ParanoiaFuel no one can be certain they aren't infectious]]''[[labelnote:*]]'''[[TheFourthWallWillNotProtectYou That includes you]]'''[[/labelnote]].
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* ''VideoGame/{{Touhou}}'''s resident {{Plaguemaster}} Yamame Kurodani is actually a friendly youkai who doesn't use her powers without reason, but her PowerIncontinence causes her to spread disease anyway. As a result, she overlaps with this trope.
* ''VideoGame/TraumaTeam'': [[spoiler:Rosalia is one of these to a degree. Even after she was killed, her blood had seeped into the ground, into the flowers, and then made the monarch butterflies become carriers of her Rosalia Virus disease. Those butterflies then spread the disease through their shed scales.]]

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* ''VideoGame/{{Touhou}}'''s ''Franchise/TouhouProject'''s resident {{Plaguemaster}} Yamame Kurodani is actually a friendly youkai who doesn't use her powers without reason, but her PowerIncontinence causes her to spread disease anyway. As a result, she overlaps with this trope.
* ''VideoGame/TraumaTeam'': ''VideoGame/TraumaCenterAtlus'': [[spoiler:Rosalia from ''Trauma Team'' is one of these to a degree. Even after she was killed, her blood had seeped into the ground, into the flowers, and then made the monarch butterflies become carriers of her Rosalia Virus disease. Those butterflies then spread the disease through their shed scales.]]
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* ''Naples '44'', by Norman Lewis, details a plan by the Allies to send prostitutes behind German lines who were infected with severe cases of syphilis. Venereal disease had infected the Allied armies in Italy but not the German military, who ran their own brothels. Unfortunately, the mission was cancelled, and the women were released so they could continue to infect Allied soldiers.

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* ''Naples '44'', by Norman Lewis, details a plan by the Allies to send prostitutes behind German lines who were infected with severe cases of syphilis. Venereal disease had infected the Allied armies in Italy but not the German military, who ran their own brothels. Unfortunately, the mission was cancelled, and the women were released [[DidntThinkThisThrough so they could continue to infect Allied soldiers.soldiers]].

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