| Guama virus | A serologic group of the genus Bunyavirus, composed of 6 species including Catu virus, and the type strain, Guama virus. (05 Mar 2000) |
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| Guaroa virus | A virus of the Bunyamwera group of the genus Bunyavirus, and an agent of bunyavirus encephalitis. (05 Mar 2000) |
| RNA tumour virus | The family of retroviruses (Retroviridae) that can cause tumours. They are enveloped by membrane derived from the plasma membrane of the host cell, from which they are released by budding without lysing the cell. Within each virion is a pair of single stranded RNA molecules. Replication involves a DNA intermediate made on an RNA template by the enzyme reverse transcriptase. (18 Nov 1997) |
| RNA virus | A group of virus's in which the core consists of RNA; a major group of animal virus's that includes the families Picornaviridae, Reoviridae, Togaviridae, Flaviviridae, Bunyaviridae, Arenaviridae, Paramyxoviridae, Retroviridae, Coronaviridae, Orthomyxoviridae, and Rhabdoviridae. Synonym: ribovirus. (05 Mar 2000) |
| pharyngoconjunctival fever virus | One of several types of adenoviruses associated with outbreaks of fever and pharyngitis, sometimes with conjunctivitis, especially in service recruits and people in boarding schools. (05 Mar 2000) |
| mice minute virus | The type species of parvovirus prevalent in mouse colonies and found as a contaminant of many transplanted tumours or leukaemias. (12 Dec 1998) |
| ross river virus | A species of alphavirus associated with epidemic exanthema and polyarthritis in Australia. (12 Dec 1998) |
| Rous-associated virus | A leukaemia virus of the leukosis-sarcoma complex which by phenotypic mixing with a defective (noninfectious) strain of Rous sarcoma virus effects production of infectious sarcoma virus with envelope antigenicity of the RAV. (05 Mar 2000) |
| Rs virus | <virology> This RNA virus is a member of the Paramyxoviridae family and is a major pathogen in the upper and lower respiratory tract in both infants and younger children. Respiratory syncytial virus manifestations include bronchiolitis, pneumonia and croup. Acronym: RSV (27 Sep 1997) |
| Rubarth's disease virus | A virus causing infectious canine hepatitis in dogs. Synonym: fox encephalitis virus, Rubarth's disease virus. (05 Mar 2000) |
| rubella virus | The type (and only) species of rubivirus causing acute infection in humans, primarily children and young adults. Humans are the only natural host. A live, attenuated vaccine is available for prophylaxis. (12 Dec 1998) |
| rubella virus vaccine | A live virus vaccine prepared from duck embryo or human diploid cell culture infected with rubella virus; administered as a single subcutaneous injection. See: measles, mumps, and rubella vaccine. (05 Mar 2000) |
| rubeola virus | <virology> Paramyxovirus that causes the childhood disease measles and is responsible for subacute sclerosing panencephalitis. (18 Nov 1997) |
| Russian autumn encephalitis virus | A virus of the genus Flavivirus (group B arbovirus) occurring particularly in Japan but probably widespread throughout Southeast Asia; the virus is normally present in humans, especially in children, as an inapparent infection, but may cause febrile response and sometimes encephalitis; it may cause encephalitis in horses and abortion in pigs; wild birds are probably the natural hosts and culicine mosquitoes the vectors. Synonym: Russian autumn encephalitis virus. (05 Mar 2000) |
| Russian spring-summer encephalitis virus | An arbovirus of the genus Flavivirus that occurs in Central Europe and the USSR in two subtypes, causing two forms of encephalitis in humans: tick-borne encephalitis (Central European subtype) and tick-borne encephalitis (Eastern subtype); the vectors are ticks of the genus Ixodes. Synonym: Russian spring-summer encephalitis virus, tick-borne virus. (05 Mar 2000) |