| salivary virus | A highly species-specific herpesvirus (cytomegalovirus) with particular affinity for the salivary gland tissue. Synonym: salivary gland virus. (05 Mar 2000) |
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| helper virus | <virology> A virus that will allow the replication of a co-infecting defective virus by producing the necessary protein. (18 Nov 1997) |
| San Miguel sea lion virus | A calicivirus, family Caliciviridae, first isolated from sea lions on San Miguel island off the California coast, which is indistinguishable from the vesicular exanthema of swine virus both biophysically and clinically in terms of the vesicular disease syndrome that it produces in swine. (05 Mar 2000) |
| progressive pneumonia virus | A retrovirus (subfamily Lentivirinae) that is the cause of maedi; it is very similar to the visna virus Synonym: medi virus, progressive pneumonia virus. (05 Mar 2000) |
| sarcoma virus | <virology> Virus that causes tumours originating from cells of connective tissue such as fibroblasts. See: Rous sarcoma virus, src. (18 Nov 1997) |
| sarcoma virus, feline | A species of mammalian type c retroviruses (retroviruses type c, mammalian) isolated from fibrosarcoma in cats. The virus is actually a recombinant feline leukaemia virus (felv) where part of the genome has been replaced by cellular oncogenes. It is unique to individuals and not transmitted naturally to other cats. Fesv is replication defective and requires felv to reproduce. (12 Dec 1998) |
| satellite virus | <virology> A term used in plant virology for a virus associated functionally, at least for the purpose of its own replication, with another virus. (18 Nov 1997) |
| hepatitis A virus | <virology> An RNA virus (hepatovirus) in the family Picornaviridae, that is the causative agent of viral hepatitis type A. The virus replicates in hepatocytes and is presumed to reach the intestine via the bile duct. Transmission occurs by the faecal-oral route. Synonym: infectious hepatitis virus. (20 Sep 2002) |
| hepatitis b virus | The type species of the genus orthohepadnavirus which causes human hepatitis b and is also apparently a causal agent in human hepatocellular carcinoma. The dane particle is an intact hepatitis virion, named after its discoverer. Non-infectious spherical and tubular particles are also seen in the serum. (12 Dec 1998) |
| hepatitis b virus, duck | A DNA virus that closely resembles human hepatitis b virus. It has been recovered from naturally infected ducks. (12 Dec 1998) |
| hepatitis b virus, woodchuck | An orthohepadnavirus causing chronic liver disease and hepatocellular carcinoma in woodchucks. It closely resembles the human hepatitis b virus. (12 Dec 1998) |
| hepatitis C virus | A non-A, non-B RNA virus causing post-transfusion hepatitis; it appears to be a member of the family Flaviviridae. (05 Mar 2000) |
| hepatitis delta virus | A defective virus, containing particles of RNA nucleoprotein in virion-like form, present in patients with acute hepatitis b and chronic hepatitis. Officially this is classified as a subviral satellite RNA (RNA, satellite). (12 Dec 1998) |
| hepatitis D virus | A small "defective" RNA virus, similar to viroids and virusoids, that requires the presence of hepatitis B virus for replication. The clinical course is variable but is usually more severe than other hepatitides. Synonym: hepatitis delta virus. (05 Mar 2000) |
| hepatitis e virus | A positive-stranded RNA virus species in the genus calicivirus, causing enterically-transmitted non-a, non-b hepatitis (hepatitis e). (12 Dec 1998) |