Viral hemorrhagic fever (VHF) is a term used to dene acute febrile hemorrhagic diseases caused by RNA viruses mostly from four virus families, namely, Arenaviridae, Bunyaviridae, Flaviviridae, and Filoviridae. Except for Filoviridae, these viruses are transmitted by vectors such as insects and rodents. The vector responsible for the transmission of viruses belonging to Filoviridae is not known so far. VHFs are characterized by severe thrombocytopenia and hemoconcentration.