This US Army medical officer, around 1900, helped discover the causes and cures for typhoid fever and yellow fever. A hospital is named after him. Who is he?

As a U.S. Army physician at the turn of the 20th century, Walter Reed made groundbreaking discoveries that revolutionized the understanding of typhoid fever and yellow fever, saving countless lives. In 1898, he was appointed to lead a board to investigate the rampant spread of typhoid fever in military camps. Through meticulous research, Reed and his colleagues demonstrated that the disease was primarily transmitted through contact with fecal matter and contaminated food or water, often by flies, rather than through the air as was commonly believed. This pivotal finding led to significant improvements in sanitation and hygiene, drastically reducing the incidence of the disease among soldiers.

Shortly after his work on typhoid, Reed turned his attention to another deadly scourge: yellow fever. In 1900, he headed the U.S. Army Yellow Fever Commission in Cuba. Building upon the theory of Cuban doctor Carlos Finlay, Reed's team conducted a series of carefully controlled experiments with human volunteers. These experiments definitively proved that yellow fever is transmitted by a specific species of mosquito (Aedes aegypti) and not by direct contact with infected individuals or their belongings. This discovery was a monumental achievement in the fields of epidemiology and public health.

The commission's findings had an immediate and profound impact. Armed with the knowledge of how yellow fever was spread, sanitation efforts led by Major W.C. Gorgas were able to eradicate the disease in Havana within months. These same mosquito control measures were later crucial to the successful completion of the Panama Canal, where yellow fever had previously killed thousands of workers. In recognition of his immense contributions to medicine and public health, a premier U.S. Army medical facility, the Walter Reed General Hospital, was opened in Washington, D.C., in 1909. This institution later evolved into the renowned Walter Reed National Military Medical Center.