Zaire is the most lethal of the six Ebolas; it is the homicidal elder sister. In the 1976 outbreak, Zaire Ebola killed 88 percent of its victims, though in subsequent outbreaks it killed roughly 60 to 70 percent. Zaire Ebola is not only the most deadly of the five Ebolas, it is also the most deadly of all the known filoviruses, the family of viruses that includes the Ebolas. Zaire Ebola is the lord of the strains.
