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An ALV-J isolate is responsible for spontaneous haemangiomas in layer chickens in China

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Subgroup J avian leukosis virus (ALV-J), first isolated in 1989, mainly induces tumours of myeloid leukosis (ML) in meat-type chickens. In 2006, ALV-J strain SCAU-HN06 was isolated from commercial layer hens with spontaneous haemangiomas in China. To confirm its role in the induction of haemangioma, we constructed a full-length copy of the proviral genome from SCAU-HN06, recovered virus from DF-1 cells detected by enzyme-linked immunosorbent assay, characterized its growth property and investigated its pathogenicity. The recovered virus appeared to be identical to SCAU-HN06 analysed by both blast gene sequences and indirect immunofluorescence assay. It also showed similarities in growth to the parental wild-type virus in vitro. The pathogenicity of the rescued and parental virus in specific-pathogen-free White Leghorn chickens was investigated. Both SCAU-HN06 and rSCAU-HN06 could induce haemangioma, with incidence of 52% and 42.8% respectively. Overall, our findings indicated that the ALV-J strain SCAU-HN06 was the causal agent inducing haemangiomas rather than ML in certain layer chickens.
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Document Type: Research Article

Affiliations: The South China Agricultural University, Key Laboratory of Animal Disease Control and Prevention, The South China Agricultural University College of Veterinary Medicine, Guangzhou, China

Publication date: June 1, 2011

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