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The original was posted on /r/todayilearned by /u/Sanguinusshiboleth on 2025-08-13 19:47:27+00:00.

Original Title: TIL that in 1900 the American Army in cuba was doing test to prove that Yellow Fever was passed by Mosquitoes via using them to infect willing test subjects until the experiements ended with the Death of Clara Maass, the only American and only woman test subject.