This is a list of the existing genera of viruses. For a list of individual species themselves, see List of viruses.

A

Adenovirus; Alfamovirus; Allexivirus; Allolevivirus; Alphacryptovirus; Alphalipothrixvirus; Alphanodoavirus; Alphapapillomavirus; Alpharetrovirus

Alpharetrovirus

Alpharetrovirus is a genus of the retroviridae family. It has type C morphology. Members can cause sarcomas, other tumors, and anaemia of wild and domestic birds and also affect rats....

; Alphavirus

Alphavirus

In biology and immunology, an alphavirus belongs to the group IV Togaviridae family of viruses, according to the system of classification based on viral genome composition introduced by David Baltimore in 1971. Alphaviruses, like all other group IV viruses have a positive sense single stranded RNA...

; Amdovirus

Amdovirus

Amdovirus is a genus of the Parvoviridae family of viruses. One well known member is Aleutian mink disease virus.-External links:* *...

; Ampelovirus; Aphthovirus

Aphthovirus

Aphthovirus is a viral genus of the family Picornaviridae. Aphthoviruses infect vertebrates, and include the causative agent of foot-and-mouth disease. Foot-and-mouth disease virus is the prototypic member of the genus Aphthovirus...

; Aquabirnavirus; Aquareovirus; Arenavirus

Arenavirus

Arenavirus is a genus of virus that infects rodents and occasionally humans. At least eight Arenaviruses are known to cause human disease. The diseases derived from Arenaviruses range in severity. Aseptic meningitis, a severe human disease that causes inflammation covering the brain and spinal...

; Arterivirus

Arterivirus

Arterivirus is a genus of virus, with type species equine arteritis virus. In 1996, the family Arteriviridae was included within the order Nidovirales. Arteriviruses are small, enveloped, animal viruses with an icosahedral core containing a positive-sense RNA genome...

; Ascovirus

Ascovirus

Ascovirus is a family of double strand DNA viruses that infect primarily invertebrates. Currently only a single genus in this family is recognised: Ascovirus....

; Asfivirus; Atadenovirus

Atadenovirus

Atadenoviruses infect animals with a broad host range from several vertebrate classes .-Types of Atadenovirus:Referenced from *Bovine adenovirus D**Bovine adenovirus 4**Bovine adenovirus 5**Bovine adenovirus 8...

; Aureusvirus; Avastrovirus; Avenavirus; Aviadenovirus; Avibirnavirus; Avihepadnavirus

Avihepadnavirus

Avihepadnavirus, is the second genus of the Hepadnaviridae family, the first genus being the Orthohepadnaviruses. The Avihepadnaviruses consist of viruses which exclusively infect birds. The type species of this genus is the duck hepatitis B virus...

; Avipoxvirus

Avipoxvirus

Avipoxvirus is a member of the Poxviridae family. The Poxviridae family is the family of viruses which cause the victim organism to have poxes as a symptom. This pox virus is one that affects birds only. Poxviruses have generally large genomes, and other such examples include smallpox and monkeypox...

; Avulavirus

Avulavirus

The genus Avulavirus is one of seven genera in the family Paramyxoviridae and contains viruses that used to be classified in the genus Rubulavirus, but which infect birds and translate protein V from an edited RNA transcript...

;

B

Babuvirus; Badnavirus; Barnavirus

Barnavirus

Barnavirus is a genus of virus, with type species Mushroom bacilliform virus.-External links:*...

; Bdellomicrovirus; Begomovirus

Begomovirus

The genus Begomovirus contains more than 200 species and belongs to the taxonomic family Geminiviridae. They are plant viruses that as a group have a very wide host range, infecting dicotyledonous plants...

; Betacryptovirus; Betalipothrixvirus; Betanodovirus; Betapapillomavirus; Betaretrovirus

Betaretrovirus

A betaretrovirus is a genus of the retroviridae family. It has type B or type D morphology. The type B is common for a few exogenous, vertically transmitted and endogenous viruses of mice; some primate and sheep viruses are the type D....

; Betatetravirus; Bocavirus

Bocavirus

Bocavirus is a genus in the family Parvoviridae, subfamily Parvovirinae.The type species is bovine bocavirus.-Genome:Like the other members of this family bocaviuses have two open reading frames - ORF1 and 2. Uniquely among parvoviruses, the bocaviruses they contain a third open reading frame...

; Bornavirus

Bornavirus

Borna disease virus is the virus that causes Borna disease.- Genome :It has the smallest genome of any Mononegavirales species and is unique within that order in its ability to replicate within the host cell nucleus....

; Bracovirus; Brevidensovirus; Bromovirus; Bymovirus;

C

Capillovirus; Capripoxvirus; Cardiovirus

Cardiovirus

Cardiovirus is a genus within the family Picornaviridae. The genus comprises two species: Encephalomyocarditis virus and Theilovirus...

; Carlavirus

Carlavirus

Carlavirus, also known as "Carnation latent virus group" is a genus of virus that infects plants. It contains thirty-five described species and twenty-nine tentative species..-Virology:...

; Carmovirus

Carmovirus

Carmovirus is a genus of the family Tombusviridae. It is classified under the Baltimore classification system as a group IV virus, having a single-stranded, positive-sense RNA genome. Replication occurs in the cytoplasm. The genome is 3800-4300 base pairs long, although the viron contains a longer...

; Caulimovirus; Cavemovirus; Chlamydiamicrovirus; Chlorovirus; Chloriridovirus; Chrysovirus

Chrysovirus

Chrysoviruses are a group of viruses in the Chrysoviridae family. They are Class III double stranded RNA viruses which infect fungi, in particular Penicillium. Their name is derived from the Greek word chrysos which means yellow-green. The virus particles are non-enveloped and icosohedral with a...

; Circovirus; Closterovirus

Closterovirus

Closterovirus, also known as beet yellows viral group, is a plant-infecting viral genus included in family Closteroviridae. This genus has a probably worldwide distribution and includes among other viral species the Beet yellows virus and the tentatively assigned Citrus tristeza virus, rather...

; Coccolithovirus

Coccolithovirus

Coccolithovirus is a genus of giant double-stranded DNA virus that infect Emiliania huxleyi, a species of coccolithophore.-Genomes:Two genomes have been sequenced Emiliania huxleyi virus 86 and Emiliania huxleyi virus 203. The genomes are ~400 kilobase pairs in length with a G+C content of 41.1%....

; Coltivirus

Coltivirus

Coltivirus is a genus of viruses that infects vertebrates, invertebrates, and plants. It includes the causative agent of Colorado tick fever....

; Comovirus; Coronavirus

Coronavirus

Coronaviruses are species in the genera of virus belonging to the subfamily Coronavirinae in the family Coronaviridae. Coronaviruses are enveloped viruses with a positive-sense single-stranded RNA genome and a helical symmetry. The genomic size of coronaviruses ranges from approximately 16 to 31...

; Corticovirus

Corticovirus

The Corticoviridae is a family of phages with a double stranded DNA genome that infect bacteria. The name is derived from Latin cortex, corticis .The family has a single genus - Corticovirus....

; Cripavirus

Cripavirus

Cripaviruses are a genus of + sense, single-stranded RNA viruses. If a ssRNA virus is +sense, it means that the viruses can produce proteins directly from their RNA genome upon entering a cell; and therefore, may not require an RNA polymerase packaged in with it, as this may be produced from the...

; Cucumovirus

Cucumovirus

Cucumovirus is a genus of virus that infects plants. It is a member of the Bromoviridae family. It contains three described species, the cucumber mosaic virus, peanut stunt virus and tomato aspermy virus....

; Curtovirus; Cypovirus

Cypovirus

Cypoviruses are a genus of viruses in the Reoviridae family. The virions have an icosahedral structure typical of other reoviruses and are 55-69 nm in diameter. The genome is composed of 10 segments of double-stranded RNA...

; Cystovirus

Cystovirus

Cystovirus is a genus of dsRNA virus, which infect certain Gram negative bacteria.- Characteristics :All cystoviruses are distinguished by their three strands of dsRNA, totalling ~14 kb in length and their protein and lipid outer layer...

; Cytomegalovirus

Cytomegalovirus

Cytomegalovirus is a viral genus of the viral group known as Herpesviridae or herpesviruses. It is typically abbreviated as CMV: The species that infects humans is commonly known as human CMV or human herpesvirus-5 , and is the most studied of all cytomegaloviruses...

; Cytorhabdovirus;

D

Dainthovirus; Deltapapillomavirus; Deltaretrovirus

Deltaretrovirus

A deltaretrovirus is a genus of the retroviridae family. It consists of exogenous horizontally-transmitted viruses found in several groups of mammals.Examples are the bovine leukemia virus and the Human T-lymphotropic virus.-External links:*...

; Deltavirus; Densovirus

Densovirus

The virus genus Densovirus belongs to the Densovirinae subfamily which belongs to the Parvoviridae family. The viruses of this genus are single-stranded DNA viruses . The viruses of this genus are invertebrate viruses, infecting crustaceans and insects...

; Dependovirus

Dependovirus

Dependovirus is a genus of the Parvoviridae viruses, which are Group II viruses according to the Baltimore classification. The Dependovirus is part of the sub family of the Parvoviridae family known as the Parvovirinae...

;

E

Ebolavirus

Ebolavirus

The genus Ebolavirus is a virological taxon included in the family Filoviridae, order Mononegavirales.This genus was introduced in 1998 as the "Ebola-like viruses". In 2002 the name was changed to Ebolavirus and in 2010 the genus was emended....

; Enamovirus; Enterovirus

Enterovirus

Enteroviruses are a genus of ssRNA viruses associated with several human and mammalian diseases. Serologic studies have distinguished 66 human enterovirus serotypes on the basis of antibody neutralization tests. Additional antigenic variants have been defined within several of the serotypes on the...

; Entomobirnavirus; Entomopoxvirus A; Entomopoxvirus B; Entomopoxvirus C; Ephemerovirus; Epsilonpapillomavirus; Epsilonretrovirus

Epsilonretrovirus

An epsilonretrovirus is a genus of the retroviridae family. It infects fish. The species include the Walleye dermal sarcoma virus, and Walleye epidermal hyperplasia virus 1 and 2.-External links:*...

; Erbovirus

Erbovirus

Erbovirus is a viral genus of the Picornaviridae family. Viruses belonging to the Erbovirus genus have been isolated in horses with acute upper febrile respiratory disease...

; Errantivirus; Erythrovirus

Erythrovirus

Erythrovirus is a genus of viruses in the family Parvoviridae.The type species is parvovirus B19.-Virology:Erythroviruses are small , non-enveloped icosahedral viruses...

; Etapapillomavirus;

F-H

Fabavirus; Fijivirus

Fijivirus

-Taxonomy:The genus Fijivirus is a member of the Reoviridae virus family. These have double-stranded RNA genomes and are therefore group III viruses...

; Flavivirus

Flavivirus

Flavivirus is a genus of the family Flaviviridae. This genus includes the West Nile virus, dengue virus, tick-borne encephalitis virus, yellow fever virus, and several other viruses which may cause encephalitis....

; Foveavirus; Fusellovirus

Fusellovirus

Fusellovirus is a genus of dsDNA virus, which infect the species of the clade Archaea. The Fuselloviridae are ubiquitous in high-temperature , acidic hot springs around the world...

; Gammalipothrixvirus; Gammapapillomavirus; Gammaretrovirus

Gammaretrovirus

A gammaretrovirus is a genus of the retroviridae family. Example species are the murine leukemia virus and the feline leukemia virus.Many endogenous retroviruses, closely related to exogenous gammaretroviruses, are present in the DNA of mammals , birds, reptiles and amphibians.Many of the...

; Giardiavirus; Granulovirus; Guttavirus

Guttavirus

Guttavirus is a genus of dsDNA virus, which infects the species of Archaea.The name is derived from the Latin word gutta meaning 'droplet'.-Virology:...

; Gyrovirus

Gyrovirus

The genus Gyrovirus, the only well known species being the chicken anemia virus, is a part of the family of Circoviridae, and consists of a nonenveloped, round, icosahedral capsid, 19-27 nm in diameter. The genome contained within consists of a single molecule of circular, single-stranded...

; Hantavirus

Hantavirus

Hantaviruses are negative sense RNA viruses in the Bunyaviridae family. Humans may be infected with hantaviruses through rodent bites, urine, saliva or contact with rodent waste products...

; Hemivirus; Henipavirus

Henipavirus

Henipavirus is a genus of the family Paramyxoviridae, order Mononegavirales containing two established species, Hendra virus and Nipah virus. The henipaviruses are naturally harboured by Pteropid fruit bats , and some microbat species...

; Hepacivirus

Hepacivirus

Hepacivirus is a genus of the Flaviviridae family of viruses. The only member of the genus is the type species, Hepatitis C virus. Hepaciviruses, like other Flaviviridae, infect mammals.-External links:* *...

; hepadnavirus; Hepatovirus

Hepatovirus

Hepatitis is a genus of viruses belonging to the family Picornaviridae. It encompasses the Hepatitis A with one unclassified virus.-External links:*...

; Hypovirus

Hypovirus

Hypoviridae is a fungal virus family . Their particularity is to encode for no capsid, and does not assemble any virion to spread. The virus never leaves its host and probably replicates in pleomorphic host-derived lipid vesicles. Transmission is probably dependent on host hyphal...

;

I-K

Ichnovirus; Ictalurivirus; Idnoreovirus; Ilarvirus

Ilarvirus

Ilarvirus is a genus of viruses.-External links:*...

; Iltovirus; Influenza A virus; Influenza B virus; Influenza C virus; Inovirus

Inovirus

Inovirus is a genus of filamentous bacteriophages. Viruses in this genus hosts with the Enterobacteriaceae, Pseudomonadaceae, Spirillaceae, Xanthomonadaceae, Clostridium and Propionibacterium...

; Iotapapillomavirus; Ipomovirus; Iridovirus; Isavirus; Iteravirus; Kappapapillomavirus; Kobuvirus

Kobuvirus

Kobuvirus is a viral genus belonging to the family Picornaviridae. The genus is composed of three species, Aichi virus, Bovine kobuvirus and Porcine kobuvirus each possessing a single serotype...

;

L

Lagovirus

Lagovirus

-Morphology:Virions consist of a capsid. Virus capsid is not enveloped, round with icosahedral symmetry. The isometric capsid has a diameter of 35-39 nm. Capsids appear round to hexagonal in outline. The capsid surface structure reveals a regular pattern with distinctive features. The capsomer...

; Lambdapapillomavirus; Leishmaniavirus; Lentivirus

Lentivirus

Lentivirus is a genus of slow viruses of the Retroviridae family, characterized by a long incubation period...

; Leporipoxvirus; Levivirus; Luteovirus

Luteovirus

Luteovirus is one of three genera in the luteoviridae family whose primary hosts are plants. The genera also contains the polerovirus and enamovirus. The geographical distribution of luteovirus is widespread, with the virus primarily infecting plants via transmission by aphid vectors. The virus...

; Lymphocryptovirus

Lymphocryptovirus

Lymphocryptoviruses are a genus of herpesviruses that include the human Epstein-Barr virus as well as viruses that infect both Old World monkeys and New World monkeys...

; Lymphocystivirus

Lymphocystivirus

Lymphocystivirus is one of five genera of viruses within the viral family Iridoviridae, and one of three genera within this family which infect teleost fishes, along with Megalocytivirus and Ranavirus...

; Lyssavirus

Lyssavirus

Lyssavirus is a genus of viruses belonging to the family Rhabdoviridae, in the order Mononegavirales. This group of RNA viruses includes the Rabies virus traditionally associated with the disease.-Structure:Viruses typically have either helical or cubic symmetry...

;

M

Machlomovirus

Machlomovirus

The Machlomovirus is a plant virus at the genus level under the family Tombusviridae.. The virus consist of a non-enveloped, round, icosahedral capsid of 30 nm. The whole gene is 4700 nucleotides in length.-External links:*...

; Macluravirus; Maculavirus; Mamastrovirus; Mandarivirus; Marafivirus; Marburgvirus

Marburgvirus

The genus Marburgvirus is the taxonomic home of one species whose members are two related viruses that form filamentous virions, Marburg virus and Ravn virus...

; Mardivirus

Mardivirus

Mardivirus is a recently established genus within the Alphaherpesvirinae subfamily. It is made up of the Marek's disease virus , which causes a lymphoproliferative disease in chickens, and two other closely related viruses including gallid herpesvirus 3 and the herpesvirus of turkeys...

; Marnavirus

Marnavirus

Marnavirus is the only known genus within the family Marnaviridae. Virions consist of a round, non-enveloped capsid with icosahedral symmetry. The capsid is isometric....

; Mastadenovirus; Mastrevirus; Megalocytivirus

Megalocytivirus

Megalocytivirus is one of five genera of viruses within the family Iridoviridae and one of three genera within this family which infect teleost fishes, along with Lymphocystivirus and Ranavirus. The megalocytiviruses are an emerging group of closely related dsDNA viruses which cause systemic...

; Metapneumovirus

Metapneumovirus

Human metapneumovirus is a negative single-stranded RNA virus of the family Paramyxoviridae and is closely related to the avian metapneumovirus subgroup C. It was isolated for the first time in 2001 in the Netherlands by using the RAP-PCR technique for identification of unknown viruses growing...

; Metavirus; Microvirus; Mitovirus; Molluscipoxvirus; Morbillivirus

Morbillivirus

Morbillivirus is a genus belonging to the Paramyxoviridae family of viruses in the order Mononegavirales. Many members of the genus cause diseases, such as rinderpest and measles, and are highly infectious.- External links :* *...

; Mupapillomavirus; Muromegalovirus

Muromegalovirus

Muromegalovirus is a genus of viruses found in rodents that belong to the betaherpesviridae subfamily of herpesviruses. Murid viruses murid herpesvirus 1 and murid herpesvirus 2 --previously defined as mouse cytomegalovirus and rat cytomegalovirus --belong to this genus....

; Mycoreovirus;

N-O

Nairovirus

Nairovirus

Nairovirus is a genus in the family Bunyaviridae that include viruses with circular, negative-sense single stranded RNA. It got its name from the Nairobi sheep disease that affects the gastrointestinal tracts of sheep and goats...

; Nanovirus; Narnavirus; Necrovirus; Nepovirus

Nepovirus

Nepoviruses or nematode transmitted polyhedral viruses, are a genus of plant viruses of the family Secoviridae and subfamily Comovirinae...

; Norovirus; Novirhabdovirus

Novirhabdovirus

Novirhabdovirus is one of the genera of Rhabdoviridae, along with Vesiculovirus, known to infect aquatic hosts. They can be transmitted from fish to fish, by waterborne virus, as well as through contaminated eggs. Replication and thermal inactivation temperatures are generally lower than for other...

; Nucleopolyhedrovirus; Nucleorhabdovirus; Nupapillomavirus; Okavirus

Okavirus

Okavirus is a genus of virus. It is the only genus in the family in the order Nidovirales. Okaviruses infect crustaceans, mostly prawns.The type species is Gill-associated virus....

; Oleavirus; Omegatetravirus; Omikronpapillomavirus; Orbivirus

Orbivirus

The genus Orbivirus is a member of the Reoviridae family. This genus currently contains 22 species and at least 130 different serotypes. Orbiviruses can infect and replicate within a wide range of arthropod and vertebrate hosts...

; Orthobunyavirus

Orthobunyavirus

Orthobunyavirus is a genus of the Bunyaviridae family.The genus is most diverse in Africa, Australia and Oceania, but occurs almost world-wide...

; Orthohepadnavirus

Orthohepadnavirus

Orthohepadnavirus is a genus of viruses belonging to the family Hepadnaviridae.- External links :* *...

; Orthopoxvirus

Orthopoxvirus

Orthopoxvirus is a genus of poxviruses that includes many species isolated from mammals, such as Camelpox virus, Cowpox virus, Ectromelia virus, Monkeypox virus, and Volepox virus, which causes mousepox. The most famous member of the genus is Variola virus, which causes smallpox...

; Orthoreovirus

Orthoreovirus

Orthoreoviruses are members of the Reoviridae virus family. They have double stranded RNA genomes and are therefore group III viruses. These viruses infect vertebrates but no disease symptoms are normally seen. In some cases however, orthoreovirus infection can lead to complications, especially in...

; Oryzavirus;

P

Panicovirus; Parapoxvirus

Parapoxvirus

Parapoxviruses belong to the Poxviridae family. Like all members of that family, they are oval, relatively large, double-stranded DNA viruses. Parapoxviruses have a unique spiral coat that distinguishes them from other poxviruses. Parapoxviruses infect vertebrates.Not all parapoxviruses are...

; Parechovirus

Parechovirus

Parechovirus is a viral genus in the family Picornaviridae. The genus is composed of two species: Human parechovirus and Ljungan virus.-Taxonomy:...

; Partitivirus; Parvovirus

Parvovirus

Parvovirus, often truncated to "parvo", is both the common name in English casually applied to all the viruses in the Parvoviridae taxonomic family, and also the taxonomic name of the Parvovirus genus within the Parvoviridae family...

; Pefudensovirus; Pestivirus

Pestivirus

Pestivirus is a genus of viruses that belong to the family Flaviviridae. Viruses in the genus Pestivirus infect mammals, including members of the family Bovidae and the family Suidae .-Virus Genetics and Structure:Pestivirus viruses have a single strand of...

; Petuvirus

Petuvirus

The genus Petuvirus belongs to the family Caulimoviridae and is classified under group VII DNA reverse transcribing viruses.Petuviruses are plant viruses. Their genome is unsegmented and monopartite containing a double-stranded DNA molecule that forms an open circle...

; Phaeovirus; Phlebovirus; Phytoreovirus

Phytoreovirus

Phytoreoviruses are non-turreted reoviruses that are major agricultural pathogens, particularly in Asia. One member of this family, Rice Dwarf Virus , has been extensively studied by electron cryomicroscopy and x-ray crystallography. From these analyses, atomic models of the capsid proteins and a...

; Pipapillomavirus; Plasmavirus

Plasmavirus

The Plasmaviridae is a family of bacteriophages, viruses that infects bacteria. Virions have an envelope, a nucleoprotein complex, and a capsid. They are 50-125 nm in diameter with a baggy or loose membrane...

; Plectrovi; Pneumovirus; Polerovirus; Polyomavirus

Polyomavirus

Polyomavirus is the sole genus of viruses within the family Polyomaviridæ. Murine polyomavirus was the first polyomavirus discovered by Ludwik Gross in 1953. Subsequently, many polyomaviruses have been found to infect birds and mammals...

; Potexvirus

Potexvirus

Potexvirus is a genus of plant pathogenic viruses, belonging to the family Alphaflexiviridae and the order Tymovirales. Transmission occurs mechanically, with viruses in this genus causing mosaic and ringspot symptoms....

; Potyvirus

Potyvirus

Potyviruses infect plants and belong to the family Potyviridae. The genus is named after the type virus - Potato Virus Y.The Potyvirus, like the Begomoviruses, have ~30% of the currently known plant viruses and have at least 180 definitive and possible members...

; Prasinovirus; Prymnesiovirus; Pseudovirus;

Q-S

Ranavirus

Ranavirus

Ranavirus is one of five genera of viruses within the family Iridoviridae, one of the five families of nucleocytoplasmic large DNA viruses . Ranavirus is the only genus within Iridoviridae that includes viruses that are infectious to amphibians and reptiles, and one of only three genera within...

; Raphidovirus; Respirovirus; Rhadinovirus

Rhadinovirus

Rhadinoviruses are a genus of herpesviruses that include the Human herpesvirus 8 , also known as Kaposi's sarcoma-associated herpesvirus , which causes Kaposi's sarcoma, primary effusion lymphoma and multicentric Castleman's disease. Other names for the Rhadinovirus genus include Rhadinoviridae...

; Rhinovirus

Rhinovirus

Human rhinoviruses are the most common viral infective agents in humans and are the predominant cause of the common cold. Rhinovirus infection proliferates in temperatures between 33–35 °C , and this may be why it occurs primarily in the nose...

; Roseolovirus

Roseolovirus

Roseolovirus refers to both Human herpesvirus 6 and Human herpesvirus 7, both members of the Betaherpesviridae subfamily of herpesvirus. They can both cause the childhood disease of roseola.-External links:* , New York Times* *...

; Rotavirus

Rotavirus

Rotavirus is the most common cause of severe diarrhoea among infants and young children, and is one of several viruses that cause infections often called stomach flu, despite having no relation to influenza. It is a genus of double-stranded RNA virus in the family Reoviridae. By the age of five,...

; Rubivirus; Rubulavirus

Rubulavirus

Rubulavirus is a genus of the Paramyxoviridae family of infectious viruses. The genus includes the mumps virus and parainfluenza type 2, 4a and 4b viruses.-External links:* http://www.biology-online.org/dictionary/Rubulavirus*...

; Rudivirus

Rudivirus

The Rudivirus are unenveloped, stiff-rod-shaped viruses with linear dsDNA genomes, that infect hyperthermophilic archaea of the kingdom Crenarchaeota.The study of crenarchaeal viruses is still incipient...

; Rymovirus; Sapovirus

Sapovirus

Sapoviruses are caliciviruses that together with the noroviruses, are the most common cause of acute viral gastroenteritis in adults. The type species is Sapporo virus...

; Seadornavirus; Sequivirus; Siadenovirus; Simplexvirus; Soymovirus; Spiromicrovirus; Spumavirus

Spumavirus

A spumavirus or foamyvirus is a genus of the retroviridae family. Spumaviruses are exogenous viruses that have specific morphology with prominent surface spikes. The virions contain significant amounts of double-stranded full-length DNA, and assembly is rather unusual in these viruses...

; Suipoxvirus;

T

Tectivirus

Tectivirus

The Tectiviridae is a family of double stranded DNA viruses that infect bacteria and archea. Tectiviridae have no head-tail structure, but are capable of producing tail-like tubes of ~ 60 x 10 nm upon adsorption or after chloroform treatment...

; Teschovirus

Teschovirus

The Teschovirus is a genus of the Picornaviridae family. This virus is responsible for the porcine enteroviral encephalomyelitis disease caused in pigs [1]. The Teschen disease which gave the name to the particular virus is a severe and fatal form of pig encephalomyelitis...

; Thetapapillomavirus; Thogotovirus

Thogotovirus

Thogotovirus is a genus in the virus family Orthomyxoviridae. It can replicate in both tick cells and vertebrate cells and is usually transmitted by ticks....

; Tombusvirus

Tombusvirus

The genus Tombusvirus are part of the family Tombusviridae and are members of group IV of the Baltimore classification of viruses. The genomes consist of positive sense single-stranded RNA with a genome size of 4800 nucleotides. The virions are non-enveloped with a diameter of 30 nm and have...

; Topocuvirus; Torovirus

Torovirus

Torovirus is a genus of viruses within the Coronaviridae family that primarily infect vertebrates. They cause gastroenteritis in mammals, including humans but rarely. Torovirus particles share characteristics with other members of the coronavirus family; they are round, pleomorphic, enveloped...

; Tospovirus

Tospovirus

The Tospoviruses are a genus of negative RNA virus found within the family Bunyaviridae. They are the sole group of plant infecting viruses in this family, as all other described members of the Bunyaviridae infect animals. The genus takes its name from the discovery of Tomato spotted wilt virus ...

; Totivirus

Totivirus

The genus Totivirus is a member of the Totiviridae family. These are a family of icosahedral nonenveloped viruses. The double-stranded RNA genomes are packaged in isometric particles 40 to 50 nm in diameter.-Genome:...

; Trichovirus

Trichovirus

Trichovirus is a non-enveloped plant pathogenic virus. It is transmitted by mites of the family Eriophyidae, requiring a helper virus for transmission. It is infectious to a number of angiosperm species.-External links:*...

; Tritimovirus; Tungrovirus; Tymovirus;

U-Z

Varicellovirus

Varicellovirus

Varicellovirus is a genus of Alphaherpesvirinae.The varicellovirus genus contains several closely related viruses, including Varicella zoster virus , the causative agent of chickenpox in humans, and Pseudorabies virus , the causative agent of Aujeszky's disease.- Morphology :As with other...

; Vesiculovirus; Vesivirus

Vesivirus

The genus vesivirus is in the Caliciviridae family of viruses. It includes feline calicivirus,San Miguel sealion virus, and vesicular exanthema of swine virus.-Morphology:...

; Vitivirus; Waikavirus; Whispovirus; Xipapillomavirus; Yatapoxvirus

Yatapoxvirus

Yatapoxvirus is a grouping of poxvirus.It includes Tanapox and Yaba monkey tumor virus....

; Zetapapillomavirus;