avian leukosis

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Related to avian leukosis: avian lymphoid leukosis

avian leukosis

(1) Marek’s disease. 
(2) See Avian leukosis-sarcoma virus group.


pertaining to or emanating from members of the class Aves. See also bird.

avian air sacs
avian broodiness
the desire to sit on eggs and hatch them is very strong in birds after they have laid a few eggs at the beginning of a new egg laying season. The procedure is a disaster for the commercial egg producer because egg laying ceases. Temporary measures are available to discourage hens from going broody but the long-term practice has been to select against it so that modern egg laying strains of birds do not show broodiness.
avian diseases
diseases affecting birds. For individual diseases see under etiological or pathoanatomic keyword, e.g. avian arizonosis, myeloblastosis (2).
avian hepatitis B-like virus
avian incubation periods
quail hatch in 16-18 days, chickens in 21, ducks in 28 days (Muscovies are an exception—33-35 days) and turkeys in 28 days. In some wild species hatching is synchronized by communication between the eggs.
infectious avian nephrosis
see infectious avian nephrosis.
avian influenza
a highly contagious disease caused by influenza A virus, affecting fowl, turkeys, pheasants and some wild birds, but rarely waterbirds or pigeons. Clinically there is a short course and very heavy mortality; birds that survive have a nasal discharge, white necrotic spots on the comb and wattles, and edema of the head and neck. Called also fowl plague. Some strains, notably H5N1 and H7N7, have emerged as the cause of fatal, but relatively rare, human infections.
avian leukosis
see avian leukosis.
avian lymphoid leukosis
see lymphoid leukosis.
avian malaria
a disease affecting most species of birds and caused by Plasmodium spp. (P. gallinaceum in fowl, P. juxtanucleare in fowl and turkeys, P. durae and P. griffithsi in turkeys). The disease is characterized by anemia which may be fatal. Transmission is by mosquitoes. See also plasmodium.
avian molt
see molting.
avian nesting
a strong biological urge to prepare a nest and lay eggs in it occurs in only some domestic birds. The building of a nest is stimulated by the previous laying of an egg.
avian oogenesis
the process from the time that the oocyte leaves the ovary until is produced with the typical avian flourish as a finished egg takes 25-26 hours. The yolk is added to the oocyte in the ovary and over a period of 60-70 days before the ovum is released. The oocyte is enveloped with albumen in the albumen-secreting section or magnum of the oviduct. The two shell membranes are added to the egg as it passes through the isthmus of the oviduct. The shell is added during a stay of about 15-20 hours in the shell gland, the last stop before the vagina. See also egg (4).
avian pox
see fowlpox.
avian reticuloendotheliosis virus
pathogenic avian retroviruses that are antigenically and genetically unrelated to avian leukosis/sarcoma retroviruses.
avian tuberculosis
see Mycobacterium aviumtuberculosis.
avian type C retroviruses
includes avian leukosis viruses and avian sarcoma viruses.
avian vibrionic hepatitis
see avian vibrionic hepatitis.


proliferation of leukocyte-forming tissue; the basis of leukemia.

avian leukosis
a complex of related diseases caused by retroviruses (oncornaviruses). lymphoid leukosis, erythroblastosis, myelocytomatosis and myeloblastosis are the principal component diseases. There are in addition a series of tumors of connective tissue, epithelium, endothelium and other miscellaneous related tumors.
cutaneous bovine leukosis
see bovine viral leukosis.
enzootic bovine leukosis
see bovine viral leukosis.
leukosis-sarcoma neoplastic diseases
includes lymphoid leukosis, erythroblastosis, myeloblastosis, myelocytomatosis, connective tissue tumors, nephroma, nephroblastoma, miscellaneous epithelial and endothelial tumors, osteopetrosis of birds caused by avian type C oncoviruses.
References in periodicals archive ?
In chicken, a retrovirus strain has been reported causing myocarditis which is closely related to avian leukosis in chicken (Gilka and Spencer, 1990).
Genomic sequence analysis and biological characteristics of rescued clone of avian leukosis virus strain JS11C1, isolated from indigenous chickens.
Emerging of avian leukosis virus subgroup Jina flock of Chinese local breed [in Chinese].
Western blot antibody reactivity to the p27 gag protein of the endogenous avian leukosis virus (ALV) in vaccine recipients and other reference chicken and human sera
Virus particles and viral antigens in chicken tissues free of infectious avian leukosis virus.
Witter, because the East Lansing lab was set up in 1939 for a similar crisis - involving less virulent strains of avian leukosis.
Mesotheliomas of peritoneum, epicardium, and pericardium induced by strain MC29 avian leukosis virus.
22) Rubin et al (23) established chickens tolerant to avian leukosis and showed that chronically viremic hens could infect their eggs with avian leukosis virus.
22-26) Avian leukosis virus causes B-cell lymphomas mainly in gallinaceous poultry, and reticuloendotheliosis virus has been associated with either B- or T-cell lymphomas in gallinaceous birds, geese, and a European starling (Sturnus vulgaris).
In chickens, lymphoid neoplasia has been associated with infections by a herpes virus (Marek's disease), avian leukosis virus, and reticuloendotheliosis virus.
Several viral diseases can present with a marked lymphocytic leukocytosis such as avian leukosis virus, reticuloendotheliosis virus, and Marek disease, (10-14) but they are not generally associated with a strong heterophilic leukocytosis.
Several novel criteria have been tested to assist in the differential diagnosis of tumors induced by Marek's disease virus (MDV) from those induced by avian leukosis virus (ALV) and reticuloendotheliosis virus (REV).