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Sylvatic yellow fever (also known as “jungle yellow fever”) occurs when the disease is passed from monkeys infected by wild mosquitoes to humans. Intermediate yellow fever—the most common type of outbreak in modern Africa—results when semi-domestic mosquitoes (which can infect both monkeys and humans) are present in an area where they commonly come into contact with humans. Urban yellow fever occurs when the Aedes aegypti species of domestic mosquito transmits the virus between humans, without transmission via other primates.