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Yellow fever is probably the most lethal of all the arboviruses. It is caused by a flavivirus that is transmitted by the Haemogogus mosquitoes and several different species of the Aedes mosquito. Although it has occurred in areas extending from Mexico to Argentina, most cases of yellow fever are in Africa and Central and South. The symptoms of yellow fever appear 3 - 6 days after exposure, and include fever, nausea, shivers, vomiting, flushed face, constipation, stomach discomfort, loss of appetite, headache, muscle pains, backache, restlessness, and irritability. A remissio