The detachment of the Hospital Corps, Camp Columbia, Cuba, pose on the Camp Columbia Hospital steps. Volunteers from this group served in Walter Reed's groundbreaking yellow fever experiments of 1900-1901, which demonstrated that the mosquito (aedes aegypti) was the vector for the spread of yellow fever. The Philip S. Hench Walter Reed
Yellow Fever Collection, September 1900.
(Department of Historical Collections and Services, Claude Moore Health Sciences Library, University of Virginia)