3.7 | Yellow Fever Outbreaks
Yellow fever is caused by a virus that originated in Africa. It is
transmitted by the bite of an Aedes aegypti mosquito. Until the
19th century, it was not recognized that the disease
spread through mosquitoes. Before that time, yellow fever was regarded
as a dangerous infection . In the 19th century, yellow fever outbreaks
were particularly common in the Americas, killing 100,000–150,000
individuals in the Southern United States.