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Yellow fever

Yellow fever is a serious viral infection that is usually spread by the Aedes aegypti mosquito. It can be prevented with a vaccination.
Risk areas for yellow fever
The World Health Organization (WHO) keeps an up-to-date list of the countries and regions where there is an increased risk of yellow fever.
Symptoms of yellow fever
After being infected with yellow fever, it usually takes 3-6 days for the symptoms to appear. This is known as the incubation period.
Causes of yellow fever
Yellow fever is caused by a type of virus known as a flavivirus. The infection is transmitted by the bite of certain mosquitoes.
Diagnosing yellow fever
Yellow fever is usually diagnosed based on the symptoms and the results of a blood test.
Treating yellow fever
There is no specific antiviral treatment for yellow fever but the symptoms can be treated.
Yellow fever vaccination
Vaccination is the most effective way of preventing yellow fever.