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The original was posted on /r/todayilearned by /u/Chemical-Elk-1299 on 2024-04-19 19:54:15.

Original Title: TIL of Dr. Jessie Lazear, an American physician who studied yellow fever under the famous Dr. Walter Reed. He allowed himself to be bitten by an infected mosquito, and died of the disease himself 17 days later, confirming how the disease was spread. His sacrifice saved millions.