Ebola virus disease was first identified in 1976 during outbreaks in Sudan and Zaire. It is caused by the Ebola virus and primarily affects humans and other primates. The virus spreads through direct contact with bodily fluids of infected individuals or animals. While its natural reservoir is unknown, fruit bats are suspected. There have been several outbreaks since 1976, with a major 2013-2014 outbreak in West Africa resulting in over 6,000 confirmed human deaths. Currently there is no approved vaccine or treatment, though supportive care is given to help fight secondary infections.