Sylvan Yellow Fever in Central America

A dramatic episode in the history of medicine is now being enacted in Central America.A wave of jungle yellow fever has moved from the long-established enzootic region of eastern Panama to the forested plains of northern Costa Rica, progressing some 450 miles since Novem- ber 1948.In its wake it has left 41 proved human fatalities among the%farming popula- tion, 8 in Panama and 33 in Costa Rica.Complete autopsies have been performed and the Colonl Elton u8 a U. S. Army medical o#fcer