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    Warning, Yellow Fever road sign

    What is Yellow Fever?

    Yellow fever virus -- found in South America and Africa -- is a very rare cause of illness in U.S. travelers, ranging in severity from a mild fever to severe liver disease with bleeding.

    How is Yellow fever transmitted?

    Yellow fever virus is transmitted to people primarily through the bite of infected Aedes or Haemagogus species mosquitoes. It is related to West Nile, St. Louis encephalitis and Japanese encephalitis viruses.

    What are the symptoms?

    The majority of persons infected with yellow fever virus have no illness or only mild illness. In persons who develop symptoms, the time from infection until illness is typically 3–6 days. Initial symptoms include sudden onset of fever, chills, severe headache, back pain, general body aches, nausea, vomiting, fatigue and weakness. Most persons improve after the initial presentation. After a brief remission of hours to a day, roughly 15% of cases progress to develop a more severe form of the disease.

    What are the complications from this disease?

    The majority of infected persons will have mild disease with complete recovery. In persons who become symptomatic but recover, weakness and fatigue may last several months. The severe form is characterized by high fever, jaundice and bleeding. It can lead to shock and failure of multiple organs. Roughly 20-50% of people who develop severe illness may die. 

    Is there a vaccine?

    Yes. Yellow fever vaccine is recommended for persons aged ≥ 9 months who are traveling to or living in areas at risk for yellow fever virus transmission in South America and Africa. 

    How can I be protected from Yellow fever virus carrying mosquitoes?

    Be mosquito free! Use approved insect repellents containing DEET to provide long lasting protection. Wear long-sleeved shirts and long pants when possible. Use air conditioning or window/door screens to keep mosquitoes outside. Dump standing water to reduce mosquitoes around your home. 

    Here's a Yellow Fever fact sheet.

    Yellow Fever vaccine
    This page was last modified on April 21, 2017


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    100 E. Weatherford, Fort Worth, Texas 76196