| mammary tumour viruses, mouse | The type species of mammalian type b retroviruses (retroviruses type b, mammalian) commonly latent in mice. It causes mammary adenocarcinoma when in a genetically susceptible strain of mice and when the appropriate hormonal influences operate. (12 Dec 1998) |
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| parainfluenza viruses | Virus's of the genus Paramyxovirus, of four types: type 1 (haemadsorption virus type 2), which includes sendai virus, causes acute laryngotracheitis in children and occasionally adults; type 2 (croup-associated virus) is associated especially with acute laryngotracheitis or croup in young children and minor upper respiratory infections in adults; type 3 (haemadsorption virus type 1; shipping fever virus) has been isolated from small children with pharyngitis, bronchiolitis, and pneumonia, and causes occasional respiratory infection in adults; bovine strains have been isolated from cattle with shipping fever, and the virus has also been isolated from sheep; type 4 has been isolated from a very few children with minor respiratory illness. (05 Mar 2000) |
| reassortant viruses | Viruses containing two or more pieces of nucleic acid (segmented genome) from different parents. Such viruses are produced in cells coinfected with different strains of a given virus. (12 Dec 1998) |
| vertebrate viruses | Viruses infecting man and other vertebrates. (12 Dec 1998) |
| viruses | <microbiology, virology> An ultra-microscopic micro-organism, parasitic within living cells and of which many can cause disease in humans. They consist of a strand of nucleic acid (DNA or RNA) that contains genetic instructions concerning viral reproduction that is enveloped by a protein coat. Cellular rupture (and death) liberates the newly from viruses. (13 Oct 1997) |
| viruses, unclassified | Viruses whose taxonomic relationships have not been established. (12 Dec 1998) |
| respiratory syncytial viruses | A group of viruses in the pneumovirus genus causing respiratory infections in various mammals. Humans and cattle are most affected but infections in goats and sheep have also been reported. (12 Dec 1998) |
| reticuloendotheliosis viruses | A subgenus of retroviruses type b, mammalian comprising a few isolates from birds, with no known corresponding endogenous relatives. (12 Dec 1998) |
| C group viruses | A serologic group of the genus Bunyavirus (formerly called group C arboviruses), composed of 12 species including Caraparu, Murutucu, and Oriboca virus. (05 Mar 2000) |
| RNA tumour viruses | Virus's of the subfamily Oncovirinae. (05 Mar 2000) |
| RNA viruses | Viruses whose genetic material is RNA. (12 Dec 1998) |
| phlebotomus fever viruses | An unclassified serologic group of arboviruses morphologically like Bunyavirus but antigenically unrelated, transmitted by Phlebotomus papatasi (sandfly) and causing phlebotomus fever; there are 20 strains, including Icoarachi and Itaporanga. Synonym: pappataci fever viruses, sandfly fever viruses. (05 Mar 2000) |
| mink cell focus-inducing viruses | Murine leukaemia viruses discovered in 1976 by hartley, wolford, old, and rowe and so named because the viruses originally isolated had the capacity to transform cell foci in mink cell cultures. Mcf viruses are generated in a multi-step process by recombination with other viral types including akr, friend, moloney, and rauscher. (12 Dec 1998) |
| mosaic viruses | Viruses which produce a mottled appearance of the leaves of plants. (12 Dec 1998) |
| plant viruses | Viruses parasitic on plants higher than bacteria. (12 Dec 1998) |