What is yellow fever?
Yellow fever is caused by a virus that affects humans. The disease occurs only in Africa and South America.

How is this virus spread?
A certain type of mosquito, Aedes aegypti, is most often responsible for spreading the virus.

Who gets yellow fever?
Infections occur almost always among forestry and agricultural workers due to exposure to infected mosquitoes in or near tropical forests.

What are the symptoms of yellow fever?
Early symptoms of yellow fever may include fever, headache, vomiting, and backache. As the disease progresses, the pulse slows and weakens, and bleeding of the gums and bloody urine occur. Yellowing of the eyes and skin may also occur.

How soon do symptoms appear?
Symptoms occur within 3 to 6 days after being bitten by an infected mosquito.

What is the treatment for yellow fever?
There is no specific treatment for yellow fever.

How can yellow fever be prevented?
Since the spread of yellow fever no longer occurs within the United States, it is important for travelers to be vaccinated before visiting areas where yellow fever exists. In addition, general precautions to avoid mosquito bites should be followed. These include the use of insect repellent, protective clothing, and mosquito netting.




This fact sheet is for informational purposes only. It should not be used for self-diagnosis or as a substitute for consultation with a health care provider. If you think that you may have this infection, or have questions about the disease described above, you should consult your health care provider.



For additional information on this disease or information related to Yellow fever vaccination, visit the Centers or Disease Control and Prevention website.

To contact the Epidemiology and Emerging Infections Program, please call 860-509-7994.