| avian viral arthritis virus | A virus of the genus Reovirus, family Reoviridae, causing tenosynovitis and arthritis in chickens. (05 Mar 2000) |
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| B19 virus | A human parvovirus associated with arthritis and arthralgia and a number of specific clinical entities, including erythema infectiosum and aplastic crisis in the presence of haemolytic anaemia. (05 Mar 2000) |
| bacterial virus | <microbiology, virology> A virus which infects bacteria and is usually species-specific. (09 Oct 1997) |
| Bittner virus | Member of the retrovirus subfamily Oncornavirinae, antigenically distinct from the murine leukaemia-sarcoma complex, that is associated with adenocarcinomatous tumours of the mammary gland, commonly latent in wild and laboratory mice and causing cancer only in genetically susceptible strains under certain hormonal influences. Synonym: Bittner agent, Bittner virus, Bittner's milk factor, mammary cancer virus of mice, milk factor, mouse mammary tumour virus. (05 Mar 2000) |
| BK virus | A human polyomavirus, in the family Papovaviridae, of worldwide distribution which produces infections that are usually subclinical in immunocompetent individuals. Origin: initials of patient from whom first isolated (05 Mar 2000) |
| bluecomb virus | A coronavirus causing bluecomb disease of turkeys. Synonym: bluecomb virus. (05 Mar 2000) |
| bluetongue virus | The type species of orbivirus causing a serious disease in sheep, especially lambs. It may also infect wild ruminants and other domestic animals. (12 Dec 1998) |
| Bolivian haemorrhagic fever virus | A member of the Arenavirus group of single-stranded RNA viruses also known as Machupo virus; primary reservoir in rodents; produces multiple abnormalities in coagulation system including widespread capillary leak syndrome, which can be fatal. (05 Mar 2000) |
| border disease virus | A species of pestivirus causing a congenital sheep disease characterised by an abnormally hairy birth-coat, tremors, and poor growth. (12 Dec 1998) |
| borna disease virus | An unclassified, single-stranded RNA virus, possibly related to the family rhabdoviridae, causing a rare and usually fatal encephalitic disease in horses and other domestic animals and possibly deer. Its name derives from the city in saxony where the condition was first described in 1894, but the disease occurs in europe, n. Africa, and the near east. (12 Dec 1998) |
| Bornholm disease virus | A virus of Enterovirus coxsackievirus type B, in the family Picornaviridae, that causes epidemic pleurodynia. Synonym: Bornholm disease virus, epidemic myalgia virus. (05 Mar 2000) |
| bovine ephemeral fever virus | A rhabdovirus causing bovine ephemeral fever in cattle. (05 Mar 2000) |
| bovine immunodeficiency virus | A lentivirus causing lymphocytosis in cattle. (05 Mar 2000) |
| bovine leukosis virus | A type C retrovirus in the subfamily Retrovirinae, commonly infecting cattle, especially dairy cows; in a small proportion of infected cattle, it will cause enzootic bovine leukosis. Synonym: bovine leukosis virus. (05 Mar 2000) |
| bovine papular stomatitis virus | A poxvirus of the genus Parapoxvirus, reported from North America, Africa and Europe, causing bovine papular stomatitis. Synonym: papular stomatitis virus of cattle. (05 Mar 2000) |