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Yellow fever

Yellow fever is a viral disease that occurs in tropical regions of Africa and the Americas. It mainly affects humans and monkeys and is transmitted by the bite of Aedes mosquitoes. It sometimes causes devastating epidemic outbreaks, which can be prevented and controlled by mass vaccination campaigns.

The first symptoms of the disease generally appear 3 to 6 days after infection. The first phase, or “acute” phase, is characterized by fever, muscle pain, headache, chills, anorexia, nausea and vomiting. After 3 to 4 days, most patients see their condition improve and the symptoms disappear.

In a few cases, however, the disease then enters a "toxic" phase: the fever reappears, the patient becomes jaundiced and hemorrhages may occur, in particular with blood in the vomitus ("vomito negro" characteristic). About half of patients in the toxic phase die after 10 to 14 days.

There is no specific treatment for yellow fever. Vaccination is strongly recommended as a preventive measure for travelers to endemic countries and the inhabitants of these countries.

Source: Health Canada