Virus classification
Group: Group IV ((+)ssRNA)
Order: Picornavirales
Family: Secoviridae
Subfamily: Comovirinae

Comovirinae is a subfamily of viruses in the order Picornavirales, in the family Secoviridae; its genera were formerly classified in the family Comoviridae. Plants serve as natural hosts. There are currently 56 species in this subfamily, divided among 3 genera.[1][2]


The genera Comovirus, Nepovirus and Fabavirus were classified into the family Comoviridae in 1993. This family was classified as part of the order Picornavirales when this order was created (2008), and its genera were reclassified as the subfamily Comovirinae of the family Secoviridae in 2009.[3][4]

Group: ssRNA(+)



Viruses in Comovirinae are non-enveloped, with icosahedral geometries, and T=pseudo3 symmetry. The diameter is around 30 nm. Genome segments are encapsidated separately into two different types of particle similar in sizenm. Genomes are linear and segmented, bipartite, around 24-7kb in length.[1]

Genus Structure Symmetry Capsid Genomic Arrangement Genomic Segmentation
ComovirusIcosahedralPseudo T=3Non-EnvelopedLinearSegmented
NepovirusIcosahedralPseudo T=3Non-EnvelopedLinearSegmented
FabavirusIcosahedralPseudo T=3Non-EnvelopedLinearSegmented

Life Cycle

Viral replication is cytoplasmic. Entry into the host cell is achieved by penetration into the host cell. Replication follows the positive stranded RNA virus replication model. Positive stranded rna virus transcription is the method of transcription. The virus exits the host cell by tubule-guided viral movement. Plants serve as the natural host. Transmission routes are mechanical.[1]

Genus Host Details Tissue Tropism Entry Details Release Details Replication Site Assembly Site Transmission
ComovirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical inoculation: beetles
NepovirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmNematodes; mites; thrips
FabavirusPlantsNoneViral movement; mechanical inoculationViral movementCytoplasmCytoplasmMechanical inoculation: aphids


  1. 1 2 3 "Viral Zone". ExPASy. Retrieved 15 June 2015.
  2. 1 2 ICTV. "Virus Taxonomy: 2014 Release". Retrieved 15 June 2015.
  3. ICTV Taxonomy History for Comoviridae, accessed on line Nov. 20, 2015.
  4. ICTV Taxonomy History for Comovirinae, accessed on line Nov. 20, 2015.

External links

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