Phylogenetic tree comparing<unk> es and marburgviruses. Numbers indicate percent confidence of branches. The genus<unk>  (- or ; - or ) is a virological taxon included in the family Filoviridae (filament-shaped viruses), order Mononegavirales. The members of this genus are called<unk> es, and encode their genome in the form of single-stranded negative-sense RNA. The six known virus species are named for the region where each was originally identified: Bundibugyo<unk> , Reston<unk> , Sudan<unk> , Taï Forest<unk>  (originally Côte d'Ivoire<unk> , Zaire<unk> , and Bombali<unk> . The last is the most recent species to be named and was isolated from Angolan free-tailed bats in Sierra Leone. Each species of the genus<unk>  has one member virus, and four of these cause<unk>  disease (EVD) in humans, a type of hemorrhagic fever having a very high case fatality rate. The Reston virus has caused EVD in other primates. Zaire<unk>  has the highest mortality rate of the<unk> es and is responsible for the largest number of outbreaks of the six known species of the genus, including the 1976 Zaire outbreak and the outbreak with the most deaths (2014).<unk> es were first described after outbreaks of EVD in southern Sudan in June 1976 and in Zaire in August 1976. The name<unk>  is derived from the Ebola River in Zaire (now the Democratic Republic of the Congo), near the location of the 1976 outbreak, and the taxonomic suffix -virus (denoting a viral genus). This genus was introduced in 1998 as the "Ebola-like viruses". In 2002, the name was changed to<unk>  and in 2010, the genus was emended.<unk> es are closely related to marburgviruses.
Ebolavirus
Henipavirus
Zika virus
Slow virus
Banna virus
Sepik virus
Helper virus
Seoul orthohantavirus