The Fifth Report of the International Committee on Taxonomy of Viruses
(ICTV), summarizes the proceedings and decisions reached by the ICTV at
its meetings held at the International Congresses of Virology in Sendai
(1984), Edmonton (1987) and Berlin (1990). This report has been
organized in the same way as the previous ones (Wildy, 1971; Fenner,
1976; Matthews, 1979; 1982), yet it encompasses many more families and
groups of viruses than previous reports, and it includes new tables,
diagrams and keys. The officers and members of the ICTV study groups
from 1984 to 1990 are listed, as the current ICTV statutes and rules of
nomenclature. Information on the format for submission of new taxonomic
proposals to the ICTV is also provided. Since the Fourth Report of the
ICTV (1982), 19 new virus families and groups have been described. This
report includes 2,430 viruses belonging to 73 families or groups, as
well as virus satellites and viroids descriptions, but it does not
include descriptions not approved by the ICTV. It now will be possible
to publish such preliminary, and in some cases controversial,
descriptions in the Virology Division pages of the Archives of Virology
--this will allow virologists to carry on the kind of interim dialogue
that is necessary for arriving at broad agreement on taxonomic matters.