Four illustrations showing the progress of yellow fever in Observations sur la fièvre jaune, faites à Cadix, en 1819, Etienne Pariset and André Mazet, Paris, 1820
Courtesy National Library of Medicine
Yellow fever is a viral infection that damages the liver. The resulting jaundice, or yellowing of the skin, is how the disease gets its name. Symptoms include a high fever, fatigue, body aches, chills, nausea, bleeding, and black vomit.