Yellow fever - How is it spread?

You mainly catch it by being bitten by an infected Aedes aegypti mosquito2 which bites during daylight hours.  In high-risk countries travellers have a higher chance of catching yellow fever in all rural and urban areas.  In built-up areas mosquitoes pass on the virus from human-to-human and out-breaks of yellow fever in densely populated areas can lead to widespread epidemics.1,2

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