| avian malaria | <veterinary> Plasmodial infections of domestic and wild birds, transmitted chiefly by culicine mosquitoes. (05 Mar 2000) |
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| avian monocytosis | An acute or subacute disease of young laying chickens characterised by lowered egg production, diarrhoea, frequently cyanosis of the head, and pathologic changes involving chiefly the liver and kidney; aetiology is not definitely established. Synonym: avian monocytosis. (05 Mar 2000) |
| avian myeloblastosis | Disease caused by the avian leukosis-sarcoma virus, which belongs to the family Retroviridae, characterised by progressive anaemia, enormous numbers of myeloblasts in the blood, weakness, and death. (05 Mar 2000) |
| avian reticuloendotheliosis | A leukosis-like disease of fowl caused by viruses of the avian type C retroviruses. (05 Mar 2000) |
| avian trichomoniasis | Trichomoniasis occurring in the upper digestive tract in a variety of birds and caused by Trichomonas gallinae; it causes necrotic ulceration in the mouth, oesophagus, crop, and proventriculus, frequently with rapid weight loss and death. (05 Mar 2000) |
| 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) |
| 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) |
| 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) |
| 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) |
| 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) |
| bovine virus diarrhoea virus | A virus of the genus Pestivirus, in the family Togaviridae, causing bovine virus diarrhoea; New York, Oregon, and Indiana strains of the virus are recognised. Synonym: mucosal disease virus. (05 Mar 2000) |
| alveolar soft part sarcoma | <tumour> A malignant tumour formed of a reticular stroma of connective tissue enclosing aggregates of large round or polygonal cells; occurs in subcutaneous and fibromuscular tissues. (05 Mar 2000) |
| ameloblastic sarcoma | <tumour> A rapidly growing, painful, destructive, radiolucent odontogenic tumour that usually arises through malignant change in the mesenchymal component of a pre-existing ameloblastic fibroma. Synonym: ameloblastic sarcoma. (05 Mar 2000) |
| angiolithic sarcoma | <tumour> A firm cellular neoplasm derived from fibrous tissue of the meninges, choroid plexus, and certain other structures associated with the brain, characterised by the formation of multiple, discrete, concentrically laminated, calcareous bodies (psammoma bodies); most of these neoplasms are histologically benign, but may lead to severe symptoms as a result of compressing the brain. Synonym: angiolithic sarcoma, sand tumour, Virchow's psammoma. (05 Mar 2000) |
| botryoid sarcoma | <tumour> A polypoid form of embryonal rhabdomyosarcoma which occurs in children, most frequently in the urogenital tract, characterised by the formation of grossly apparent grapelike clusters of neoplastic tissue that consist of rhabdomyoblasts, spindle, and stellate cells in a myxomatous stroma; neoplasms of this type grow relatively rapidly and are highly malignant. (05 Mar 2000) |