The original post: /r/todayilearned by /u/JackThaBongRipper on 2024-10-09 00:40:40.

Original Title: TIL that in 1900, a physician named Jesse William Lazear wanted to prove that yellow fever was transmitted by mosquitoes. He allowed an infected mosquito to bite him, and he became infected with yellow fever, proving the hypothesis correct. He died 17 days later.