Book excerpt: The Ebola and Marburg viruses are a pair of filoviruses that are among the most lethal hemorrhagic viruses on the planet. The authors present a review of past and current research into these pathogens, including 12 papers addressing the structure of the viral proteins; genomic replication; molecular mechanisms of entry; pathogenesis in nonhuman primates, guinea pigs, and mice; virus modulation of innate immunity; and cellular and molecular mechanisms of Ebola pathogenicity and related approaches to vaccine development.