Ebola and Marburg viruses both cause severe haemorrhagic fevers. Much research has been performed in recent years on the molecular and genetic properties of these viruses and in particular has focused on molecular structure, replication and virus-host interactions. This book presents a comprehensive review of the current research on these highly virulent viruses. Topics covered include the genomics of the Filoviridae, molecular properties, taxonomy, replication, evolution, epidemiology, pathogenicity, virus-host interactions and the immune response.