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Medical staff at work, Walter Reed Hospital
Doctors work on other cures at the Walter Reed Hospital, named after the pathologist who proved the mosquito spread yellow fever

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U.S. Army Physicians Discovered the Cause of Yellow Fever
August 27, 1900

No one knew what caused the often-deadly yellow fever, but it occurred in epidemic proportions, with one person after another in a given area becoming sick. People feared the mysterious disease, until U.S. Army physician James Carroll endangered his own health in the name of science. On August 27, 1900, Carroll allowed an infected mosquito to feed on him. He developed a severe case of yellow fever but helped his colleague, Walter Reed, prove that mosquitoes transmitted the feared disease.
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