| malaria, avian | Any of a group of infections of fowl caused by protozoa of the genera plasmodium, leucocytozoon, and haemoproteus. The life cycles of these parasites and the disease produced bears strong resemblance to those observed in human malaria. (12 Dec 1998) |
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| paramyxoviruses, avian | A group of viruses in the genus rubulavirus causing disease in domestic fowl. There are many species, the most well-known being avian paramyxovirus 1 (newcastle disease virus). (12 Dec 1998) |
| reticuloendotheliosis virus, avian | A species of reticuloendotheliosis viruses of the genus retroviruses type b, mammalian that causes a chronic neoplastic and a more acute immunosuppressive disease in fowl. (12 Dec 1998) |
| retroviruses type c, avian | A genus of the family retroviridae with type c morphology, that causes malignant and other diseases in wild birds and domestic fowl. (12 Dec 1998) |
| myeloblastosis virus, avian | A species of avian type c retroviruses (retroviruses type c, avian) causing anaemia in fowl. (12 Dec 1998) |
| sarcoma, avian | Connective tissue tumours, affecting primarily fowl, that are usually caused by avian sarcoma viruses. (12 Dec 1998) |
| sarcoma viruses, avian | Species of avian type c retroviruses (retroviruses type c, avian) producing sarcomata and other tumours in chickens and other fowl and also in pigeons, ducks, and rats. (12 Dec 1998) |
| infectious avian bronchitis | A specific infectious disease of young birds, caused by infectious bronchitis virus, a member of Coronaviridae, and associated with blocking of respiratory passages by exudate; it is highly transmissible, and often causes heavy losses of young chicks and heavy production losses among older laying birds. Synonym: gasping disease. (05 Mar 2000) |
| infectious bronchitis virus, avian | A species of coronavirus causing infections in chickens and possibly pheasants. Chicks up to 4 weeks old are the most severely affected. (12 Dec 1998) |
| influenza a virus, avian | Strains of influenza a virus causing influenza in birds. Transmission is caused by close contact or is waterborne in aquatic species. (12 Dec 1998) |
| encephalomyelitis virus, avian | A species of enterovirus infecting primarily young chicks, but also found in turkeys, pheasants, and guinea fowl. It causes a fatal neuronal degeneration and is transmitted by mechanical contact. (12 Dec 1998) |
| erythroblastosis virus, avian | A species of avian type c retroviruses (retroviruses type c, avian) causing progressive anaemia and weakness in domestic and wild fowl. (12 Dec 1998) |
| tuberculosis, avian | A variety of tuberculosis affecting various birds, including chickens and ducks. It is caused by mycobacterium avium and characterised by tubercles consisting principally of epithelioid cells. It may be transmitted to other animals including man. (12 Dec 1998) |
| leukosis virus, avian | The type species of avian type c retroviruses (retroviruses type c, avian) producing latent or manifest lymphoid leukosis in fowl. (12 Dec 1998) |