Yellow fever is an acute systemic illness - a hemorrhagic fever - caused by the Flavivirus. Acute means it comes on (onset) rapidly, while systemic means it affects the whole body. In severe cases yellow fever causes a high fever, bleeding into the skin and the death of cells in the liver and kidney. Liver damage results in severe jaundice - yellowing of the skin; hence the name "yellow fever". The mosquito Aedes aegypti, and some other species transmit the virus to humans...
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