Epidemiology Week 6, 2016

Weekly Spotlight

Yellow fever outbreak in Angola: February Health News

Key facts

 Yellow fever is an acute viral haemorrhagic disease transmitted by infected mosquitoes. The “yellow” in the name refers to the jaundice that affects some patients.
 Up to 50% of severely affected persons without treatment will die from yellow fever.
 There are an estimated 200 000 cases of yellow fever, causing 30 000 deaths, worldwide each year, with 90% occurring in Africa.
 The virus is endemic in tropical areas of Africa and Latin America, with a combined population of over 900 million
people.
 The number of yellow fever cases has increased over the past two decades due to declining population immunity to
infection, deforestation, urbanization, population movements and climate change.
 There is no specific treatment for yellow fever. Treatment is symptomatic, aimed at reducing the symptoms for the
comfort of the patient.
 Vaccination is the most important preventive measure against yellow fever. The vaccine is safe, affordable and
highly effective, and a single dose of yellow fever vaccine is sufficient to confer sustained immunity and life-long
protection against yellow fever disease and a booster dose of yellow fever vaccine is not needed. The vaccine provides effective immunity within 30 days for 99% of persons vaccinated.

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