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1 Avian leukosis in egg-type chickens is infectious neoplastic disease caused by avian leukosis viruse subgroup J( ALV-J).

2 These results showed that the subgroup J avian leukosis virus infections existed in the layer populations in Hubei Province, but the infection rates were different among the 4 breeds.

3 Avian leukosis virus Subgroup J (ALV-J) is a retro virus which infects meat-type chickens.

4 The occurrence of Avian Leukosis Virus-J Subgroup on the Commercial layer of Roman reported was the first time at home and abroad.

5 ALV-J most causes myeloid leukosis, while other exogenous ALVs mainly induce lymphoid leukosis.

6 There were lymphoid leukosis virus and group specific antigen in the follicles with BA dying which was highest in content from the 3rd to 4th month of PI.

7 Avian leukosis virus Subgroup J is a retro virus which infects meat-type chickens.

8 Chickens on the incidence of blood samples were randomly collected 35 by Avian Leukosis Virus-J Subgroup detection ELISA kit, the positive rate reached 5.

9 This is the first confirmed at the molecular level that avian leukosis subgroup J occurred in the egg-type chickens in the world.

10 It is a preliminary report of the Research on Rapid Differentiation for Avian Tumorse. g. Marek's Disease(MD),(www.Sentencedict.com) Lymphocyte Leukosis (LL) and Reticuloendotheliosis (RE).

11 This review focuses on the relationship between the function of T, B lymphocytes and the pathogenesis of Enzootic Bovine Leukosis.