Yellow fever is an infectious disease difficult to diagnose, transmitted by species of Aedes and Haemogogus mosquitoes.
It is endemic in 44 countries in Africa and Latin America.
The main way to prevent yellow fever is vaccination, mandatory in some countries.
The incubation period of the disease can take up to 6 days may infection occurs in two phases, acute, in which symptoms are usually fever, muscle pain with prominent backache, headache, chills, loss of appetite, nausea and vomiting.
The second phase of the infection, the most toxic, occurs only in some cases and the patient may manifest fever, jaundice, abdominal pain, accompanied by vomiting; bleeding in the mouth, eyes, nose and stomach, and blood may appear in vomit or faeces. The second phase of the disease is very serious and the patient may die within 10 to 14 days.