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KMID : 1023520100330010013
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Korean Journal of Veterinary Service
2010 Volume.33 No. 1 p.13 ~ p.21
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Investigation of infection rate and genetic sequence analysis of chicken infectious anemia virus
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Chu Keum-Suk
Kang Mi-Seon
Lee Jeong-Won
Song Hee-Jong
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Abstract
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Chicken anemia virus (CAV) has been recognized as an immunosuppressive agent and plays role as an etiological agent of multifactorial diseases in chicken. In this study, we investigated distribution of CAV antibody by ELISA and the virus gene by PCR in poultry farms in Jeongeup, Jeonbuk province. In the test using ELISA kit, 41 (95.3%) of 43 flocks and 88.6% of the individual chickens were positive, respectively. By PCR, 90.9% of the broiler breeders and 75.0% of White-semi breeders were found positive, respectively. All hatchery was negative by PCR. Of the clinical cases from 49 poultry flocks, 87.5% of flocks and 54.7% for each samples were found positive by ELISA, respectively. By PCR test, 21 (42.9%) of 49 flocks were positive. Major clinical signs of the infected flocks were growth retardation, femoral subcutaneous bleeding, depression, limping, and continuing selection. The genetic analysis of separate N genes of CAV showed highly homologous each other. The nucleotide sequence of field isolates had homology ranged from 99.9% to 97.5% with Chinese strains, and 99.9% to 99.6% with Japanese strain. Phylogenetic analysis based on the N gene of CAV isolates showed the closely relation with Chinese strains. The results of this survey could be used as basic data for development of vaccine.
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KEYWORD
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Chicken anemia virus, ELISA, Genetic analysis
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