During the 19th century, the pernicious "yellow fever" killed approximately 100,000 people in the United States. On the basis of a controversial theory from Dr. Carlos Finlay, U.S. Army Chief Surgeon Walter Reed led an expert team to Cuba in order to find out if, in fact, the illness could be spread by mosquitoes. This "American Experience" program chronicles the heroic efforts of Reed's squad to discover the answers. 60 min. Soundtrack: English Dolby Digital stereo.