It has been estimated that for every 1 case of severe infection, there are between 1 and 70 infections that are asymptomatic or mild.īy the time shiploads of refugees from the French colony of St. A small percentage of people infected with the virus develop a life-threatening form of the disease that involves high fevers, internal bleeding, vomiting of blood and jaundice-which is where the “yellow” in yellow fever comes from.
While many who are infected do not experience any symptoms or have mild symptoms, others have fever, muscle pain, headache, nausea and vomiting. The hungry mosquitos then spread the virus from infected to uninfected in the New World. The virus followed when slaves from areas with endemic disease arrived. via water barrels on trade ships arriving from countries with endemic yellow fever. The mosquito vector was likely introduced to the U.S. The yellow fever virus most likely originated in Africa and arrived in the Western Hemisphere in the 1600s as a result of slave trade. Yellow fever is caused by a virus in the family Flaviviridae, and it is transmitted by the Aedes aegypti mosquito.
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