Yellow fever
Yellow fever is a mosquito-borne viral infection. Many infections cause little or no illness, but some progress to a severe form that damages the liver and other organs. Yellowing of the skin or eyes gives the disease its name. Severe yellow fever can be fatal, so symptoms after possible exposure need prompt medical assessment.
Prevention: Vaccine
Symptoms
- Fever, chills, headache, and muscle or back pain
- Nausea, vomiting, and marked tiredness
- In severe illness, yellow skin or eyes, bleeding, or shock
Transmission
- Bites from infected mosquitoes
Prevention
Prevent mosquito bites and discuss vaccination before entering a risk area. Vaccine suitability depends on health circumstances as well as the destination; individual assessment matters. Some countries require proof of vaccination, so check current entry guidance before travel.
Where it occurs
Transmission occurs in parts of tropical Africa and South America. Risk varies with location, season, outbreaks, and outdoor exposure.
Diagnosis and care
There is no specific antiviral treatment. Care supports the body and manages complications, often in hospital for severe illness. Prevent further mosquito bites during illness to reduce the chance of onward transmission.
Source
- Yellow Fever
Based on CDC information
Source language: English
Source reviewed: April 23, 2025
Source accessed: May 17, 2026
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