Walter Reed
Walter Reed (September 13, 1851 – November 23, 1902) was an American pathologist and U.S. Army medical officer renowned for directing the United States Army Yellow Fever Commission, which conclusively demonstrated through human experiments that yellow fever is transmitted exclusively by the bite of the Aedes aegypti mosquito, overturning prevailing theories of direct human contact or contaminated fomites.[1][2] Born in Gloucester County, Virginia, Reed graduated from the University of Virginia School of Medicine at age 18 and joined the Army Medical Corps in 1875, rising to major by 1898 amid the Spanish-American War's disease crises.[3][4] In 1900, appointed by Surgeon General George Sternberg, Reed led a commission including Aristides Agramonte, James Carroll, and Jesse Lazear to investigate yellow fever outbreaks in Cuba, building on Cuban physician Carlos Finlay's mosquito hypothesis while rigorously testing alternatives like the filth theory.[5] Their Camp Lazear experiments, involving controlled exposures of volunteers—including self-experimentation by Carroll and fatal infection of Lazear—provided empirical proof of mosquito vector transmission, enabling subsequent public health measures like vector control that eradicated yellow fever from Havana within months.[1][2] Reed's prior work on typhoid fever epidemiology, identifying Salmonella typhi as the causative agent via autopsy studies, further established his expertise in infectious disease causation.[4] Reed's discoveries laid foundational principles for modern vector-borne disease control and earned him posthumous honors, including the naming of Walter Reed Army Medical Center and a 1940 U.S. postage stamp; he died prematurely from appendicitis complications at age 51, shortly after promotion to professor of bacteriology at the Army Medical School.[3][4] The commission's primary records, preserved in collections like the Philip S. Hench Walter Reed Yellow Fever archive, underscore the empirical rigor of their methods amid high personal risks, contrasting with less verifiable contemporary accounts.[6]