The scourge of 19th-century America, yellow fever stymied health officials for decades before a team of doctors and scientists ventured to Cuba for answers. This documentary tells their story. When a yellow fever outbreak threatened the lives of U.S. soldiers occupying Cuba in 1900, the U.S. Army sent a team to investigate. Soon, they found the culprit -- mosquitoes -- and set in motion the first public health triumph of the 20th century.