This site provides a central source of information about viruses, viroids and satellites of plants, fungi and protozoa, with some additional data on related animal viruses. Over 390 individual descriptions of plant viruses or virus groups are provided. Nos 1-354 were originally published in paper form by the Association of Applied Biologists (AAB) between 1970 and 1989, while additional descriptions have been added to a CD-ROM (also published by the AAB) since 1998. This internet version uses the same databases as the CD-ROM version. The descriptions can be accessed from the indexes in the DPV menu or from the Taxonomy pages. New descriptions are being commissioned and will be added as they become available.