| 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) |
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| 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) |
| Bunyamwera virus | A serologic group of the genus Bunyavirus, composed of over 150 virus types in the family Bunyaviridae. Origin: Bunyamwera, Uganda, where first isolated (05 Mar 2000) |
| B virus | A herpesvirus, in the family Herpesviridae, affecting Old World monkeys, that is very similar morphologically to herpes simplex virus; fatal infection may occur in humans following the bite of an infected monkey, although other modes of transmission have also been documented. Synonym: monkey B virus. (05 Mar 2000) |
| Bwamba virus | A genus of viruses in the family Bunyaviridae; a serologic group of the genus Bunyavirus; associated with cases of Bwamba fever in Uganda. Origin: Bwamba, forest in Uganda where first isolated (05 Mar 2000) |
| California virus | A serologic group of the genus Bunyavirus, comprising over 14 strains including La Crosse and Tahyna virus, and the type strain, California virus, which causes encephalitis, chiefly in the age group 4 to 14 years. (05 Mar 2000) |
| camelpox virus | An orthopoxvirus causing camelpox in camels. (05 Mar 2000) |
| canarypox virus | A poxvirus of the genus Avipoxvirus causing a fatal disease of canaries, and also infecting sparrows. (05 Mar 2000) |
| canine distemper virus | An RNA virus of the genus Morbillivirus, a member of the family Paramyxoviridae, that causes canine distemper. Synonym: dog distemper virus. (05 Mar 2000) |