Yellow fever is an acute viral hemorrhagic disease
transmitted by the bite of an infected mosquito, which is the primary vector. It
carries the virus, an arbovirus of the flavivirus genus, from one host to
another, mainly between monkeys, from monkeys to humans, and from person to
person. It gets its name from the yellowing of the skin and eyes (jaundice).
The virus is endemic in tropical areas.
Most people experience a first phase with flu-like symptoms that disappear after
3 to 4 days. Then, follow a second phase of remission that lasts for one or two
days. However, 15% of patients enter a third, more toxic phase, in which the
patient gets severe symptoms such as high fever, hemorrhage, jaundice, vomiting
blood, seizures, and multiple organ dysfunction.
Yellow fever is difficult to diagnose, especially during the early stages. The
virus incubates in the body for 3 to 6 days.