" At this writing there are six known species of Ebola. The six Ebola sisters. In order of discovery, the six Ebolas are named Zaire Ebola, Sudan Ebola, Reston Ebola, Taï Forest Ebola, Bundibugyo Ebola, and Bombali Ebola. "

― Richard Preston , Crisis in the Red Zone: The Story of the Deadliest Ebola Outbreak in History, and of the Outbreaks to Come