| avian influenza virus | <virology> A type A influenza virus (genus Influenzavirus) that causes fowl plague. Synonym: fowl plague virus. (05 Mar 2000) |
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| avian leukaemia virus | <virology> Group of C type RNA tumour viruses (Oncovirinae) that cause various leukaemias and other tumours in birds. The acute leukaemia viruses, that are replication defective and require helper viruses, include avian erythroblastosis (AEV), myeloblastosis (AMV) and myelo cytomatosis viruses. AEV carries two transforming genes, v erbA and v erbB, the cellular homologue of the latter is the structural gene for the epidermal growth factor receptor. AMV carries v myb and causes a myeloid leukaemia, avian myelocytomatosis virus carries v myc. The avian lymphatic leukaemia viruses (ALV) are also Retroviridae but are replication competent and induce neoplasia only after several months, they often occur in conjunction with replication defective leukaemia viruses. (02 Jan 1998) |
| avian leukosis-sarcoma virus | avian leukosis-sarcoma complex |
| avian lymphomatosis virus | avian leukosis-sarcoma complex |
| avian myeloblastosis virus | avian leukosis-sarcoma complex |
| avian neurolymphomatosis virus | The herpesvirus that causes avian lymphomatosis (Marek's disease); is distinct from those causing other forms of leukosis. Synonym: avian lymphomatosis virus, fowl neurolymphomatosis virus, Marek's disease virus. (05 Mar 2000) |
| avian pneumoencephalitis virus | <virology> A paramyxovirus that causes the fatal disease, fowl pest, in poultry. (18 Nov 1997) |
| avian sarcoma virus | avian leukosis-sarcoma complex |
| avian viral arthritis virus | A virus of the genus Reovirus, family Reoviridae, causing tenosynovitis and arthritis in chickens. (05 Mar 2000) |
| 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) |