Yellow fever cycle, both in Africa and South America, a sylvatic cycle (forest or jungle cycle) is present, where "Aedes africanus" (in Africa) or mosquitoes of the genus "Haemagogus" and "Sabethes" (in South America) serve as vectors. In the jungle, the mosquitoes infect mainly nonhuman primates; the disease is mostly asymptomatic in African primates. In South America, the sylvatic cycle is currently the only way humans can become infected, which explains the low incidence of yellow fever cases on the continent. People who become infected in the jungle can carry the virus to urban areas, where "A. aegypti" acts as a vector.
Yellow Fever Commission Yellow Fever Commission The Yellow Fever Commission was a research team of the United States Army which researched treatment for yellow fever. The research process itself became a focus of study for later generations. A United States nurse named Clara Maass and two Spanish immigrants were among those who died as a result of their research participation. Researchers mark the research of the Yellow Fever Commission as the origin of the model of modern consent in medical research. The 1934 play "Yellow Jack" told the story of Walter Reed in the Yellow Fever Commission. That play was the basis of