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The page below is a sample from the LabCE course Ebola Virus Disease (EVD) and Clinical Laboratory Safety in the United States. Access the complete course and earn ASCLS P.A.C.E.-approved continuing education credits by subscribing online.

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Classification and Common Characteristics of Viral Hemorrhagic Fevers (VHFs):

Viral hemorrhagic fevers (VHFs) are caused by four different families of RNA viruses:

FamilyViruses Included
Filoviridae Ebola and Marburg
Arenaviridae Lassa fever
    Bunyaviridae Hantaviruses
      Flaviviridae Yellow fever and dengue

      There are several characteristics that these four families of viruses have in common:
      • ALL are single-stranded RNA viruses
      • ALL are contained within a lipid/fatty envelope
      • ALL require an animal or insect host (known as the natural reservoir) for their survival
      • NONE use humans as their natural reservoir