Positive-sense SsRNA Viruses
There are three orders and 30 families recognised in this group. In addition there are a number of unclassified species and genera.
A new family in the order Nidovirales - Mesoniviridae - with a new genus - Alphamesonivirus - has been proposed for the viruses Cavally virus and Nam Dinh virus has been proposed and awaits approval (or otherwise) by the ICTV.
- Order Nidovirales
- Family Arteriviridae
- Family Coronaviridae - includes Coronavirus, SARS
- Family Roniviridae
- Order Picornavirales
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- Family Dicistroviridae
- Family Iflaviridae
- Family Marnaviridae
- Family Picornaviridae - includes Poliovirus, the common cold virus, Hepatitis A virus
- Family Secoviridae includes subfamily Comovirinae
- Genus Bacillariornavirus
- Genus Labyrnavirus
- Order Tymovirales
- Family Alphaflexiviridae
- Family Betaflexiviridae
- Family Gammaflexiviridae
- Family Tymoviridae
- Unassigned
- Family Alphatetraviridae
- Family Alvernaviridae
- Family Astroviridae
- Family Barnaviridae
- Family Bromoviridae
- Family Caliciviridae - includes Norwalk virus
- Family Carmotetraviridae
- Family Closteroviridae
- Family Flaviviridae - includes Yellow fever virus, West Nile virus, Hepatitis C virus, Dengue fever virus
- Family Leviviridae
- Family Luteoviridae - includes Barley yellow dwarf virus
- Family Narnaviridae
- Family Nodaviridae
- Family Permutotetraviridae
- Family Potyviridae
- Family Togaviridae - includes Rubella virus, Ross River virus, Sindbis virus, Chikungunya virus
- Family Tombusviridae
- Family Virgaviridae
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- Unassigned genera
- Genus Benyvirus
- Genus Cilevirus
- Genus Hepevirus - includes Hepatitis E virus
- Genus Idaeovirus
- Genus Ourmiavirus
- Genus Polemovirus
- Genus Sobemovirus
- Genus Umbravirus
- Unassigned genera
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- Unassigned species
- Botrytis virus F
- Canine picodicistrovirus
- Chronic bee paralysis associated satellite virus
- Extra small virus
- Heterocapsa circularisquama RNA virus
- Le Blanc virus
- Orsay virus
- Santeuil virus
- Unassigned species