20% to 50% of infected persons who develop severe disease die.
Yellow fever
General Information
The virus is endemic in tropical areas of Africa and Central and South America.
Yellow fever is prevented by an extremely effective vaccine, which is safe and affordable. A single dose of yellow fever vaccine is sufficient to grant sustained immunity and life-long protection against yellow fever disease.
Transmission
Yellow fever is an acute viral haemorrhagic disease transmitted by infected mosquitoes.
Symptoms
Symptoms of yellow fever include fever, headache, jaundice, muscle pain, nausea, vomiting and fatigue.
A small proportion of patients who contract the virus develop severe symptoms and approximately half of those die within 7 to 10 days.
Epidemiology
Yellow fever virus is estimated to cause 200,000 cases of disease and 30,000 deaths each year, with 90% occurring in Africa.
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