Rockefeller researchers traveled to yellow fever hotspots such as South America and Africa. Several of them died from the disease. One researcher, Dr. Alexander Mahaffy, discovered in 1927 that ...

A persistent myth claimed that since yellow fever was known in Africa, black people had a natural resistance to yellow fever. There is no such thing as inherited immunity, however, and slaves who ...

Philadelphia's yellow fever epidemic of 1793 was the largest in the history of the United States, claiming the lives of nearly 4000 people. In late summer, as the number of deaths began to climb ...