yellow fever
US /ˌjel.oʊ ˈfiː.vər/
UK /ˌjel.oʊ ˈfiː.vər/

1.
a tropical viral disease affecting the liver and kidneys, causing fever and jaundice and often fatal. It is transmitted by mosquitoes.
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The doctor diagnosed him with yellow fever after he returned from his trip to the Amazon.
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Vaccination is highly recommended for travelers to areas where yellow fever is endemic.