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The [[International Committee on Taxonomy of Viruses]] (ICTV) classifies RNA viruses as those that belong to ''Group III'', ''Group IV'' or ''Group V'' of the [[Virus classification#Baltimore classification|Baltimore classification]] system. This category excludes ''Group VI'', viruses with RNA genetic material but which use [[DNA]] intermediates in their [[Viral life cycle|life cycle]]: these are called [[retrovirus]]es,<ref name="titleListing in Taxonomic Order—Index to ICTV Species Lists">{{cite web|title=Listing in Taxonomic Order – Index to ICTV Species Lists|url=https://www.ncbi.nlm.nih.gov/ICTVdb/Ictv/fr-fst-g.htm|access-date=2008-04-11}}</ref> including [[HIV-1]] and [[HIV-2]] which cause [[AIDS]]
As of May 2020, all known RNA viruses encoding an RNA-directed RNA polymerase are believed to form a monophyletic group, known as the realm ''[[Riboviria]]''.<ref>{{cite journal |title=The new scope of virus taxonomy: partitioning the virosphere into 15 hierarchical ranks |journal=Nature Microbiology |date=May 2020 |volume=5 |issue=5 |pages=668–674 |doi=10.1038/s41564-020-0709-x|pmid=32341570 |doi-access=free |author1=International Committee on Taxonomy of Viruses Executive Committee |pmc=7186216 }}</ref> The majority of such RNA viruses fall into the kingdom ''[[Orthornavirae]]'' and the rest have a positioning [[Incertae sedis|not yet defined]].<ref name=ortho>TaxoProp [https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=201907198 2019.006G]</ref> The realm does not contain all RNA viruses: ''[[Deltavirus]]'', ''[[Asunviroidae]]'', and ''[[Pospiviroidae]]'' are taxa of RNA viruses that were mistakenly included in 2019,{{efn|1=This inclusion was due to TaxoProp [https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=201907095 2017.006G], which proposed ''Riboviria''. The confusion might be due to the TaxoProp's reference to a "monophyly of all RNA viruses", improperly termed as it was only demonstrated with RdRP. On the other hand, the proposed definition of ''Riboviria'' did correctly mention RdRP
.}} but corrected in 2020.<ref>TaxoProp [https://talk.ictvonline.org/taxonomy/p/taxonomy-history?taxnode_id=201905347 2019.009G]</ref> ==Characteristics==
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