This encyclopedic reference contains the latest knowledge on all virus genera in the standardized format of lists, tables and figures. Each of the 241 taxonomically ordered chapters provides highly structured and condensed information on a single virus genus from a leading world expert. The data covers individual genus members, historical events, virion morphology, genome properties, replication strategy, properties of individual transcripts and proteins, sequence accession numbers, biological properties, diseases, recombinant vector constructs, vaccine strains, key references, as well as a high-resolution particle image and a drawing of the genome organization. An indispensable tool for both researchers and lecturers.