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Yes, it is in 32 African countries. The population is around 610 million people.

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There is a yellow fever vaccine.  It has been available for at least 80 years.  The vaccine is given by a single shot.

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There is no treatment for the yellow fever.  There is controlling the symptoms though, such as medicines to help headaches and fevers, resting, and drinking water.

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Most people don't experience symptoms. The symptoms are fever, muscle pain, backaches, headaches, loss of appetite, and nausea.

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The yellow fever was carried by mosquitos. It started in the USA in the late 1690's. The fever stays in the body for 3-6 days.