Page "RNA virus" Paragraph 22

Additional work has identified five groups of positive stranded RNA viruses containing four, three, three, three and one order ( s ) respectively.

These fourteen orders contain 31 virus families ( including 17 families of plant viruses ) and 48 genera ( including 30 genera of plant viruses ).

This analysis suggests that alphaviruses and flaviviruses can be separated into two families-the Togaviridae and Flaviridae respectively-but suggests that other taxonomic assignments, such as the pestiviruses, hepatitis C virus, rubiviruses, hepatitis E virus and arteriviruses, may be incorrect.

The coronaviruses and toroviruses appear to be distinct families in distinct orders and not distinct genera of the same family as currently classified.

The luteoviruses appear to be two families rather than one and apple chlorotic leaf spot virus appears not to be a closterovirus but a new genus of the Potexviridae.