Abstract
Avian leukosis virus subgroup J (ALV-J) is the most prevalent subgroup in chickens and exhibits increased pathogenicity and stronger horizontal and vertical transmission ability among different breeds. Although vertical transmission of ALV-J from infected hens through artificial insemination has been inferred from the detection of the p27 antigen in swabs and serum, there has been no further research on the transmission pattern of ALVs in roosters. In the present study, the positive rate of ALV increased significantly in an indigenous flock after detecting the p27 antigen via enzyme-linked immunosorbent assay (ELISA) and virus isolation in DF-1 cells. Viral sequence comparisons and an indirect fluorescent antibody assay showed that these isolates belonged to the ALV-J subgroup but formed a new branch in a phylogenetic tree when compared to domestic and foreign referential strains. The gp85 gene of the ALV-J isolated from hens and albumen was 94.1–99.7% identical to that in roosters, revealing that these isolates were quite likely transmitted to the hens and their offspring through the semen of ALV-infected roosters by artificial insemination from the Hy-line brown roosters. In addition, we defined four ALV-J infection states in plasma and semen of roosters (P+S+, P-S+, P+S-, and P-S-), which suggests that, in order to eradicate ALV in roosters, it is necessary to perform virus isolation using both semen and plasma. Additionally, ALV detection in semen by ELISA produced false-positive and false-negative results when compared to virus isolation in DF-1 cells. Collectively, our results suggested that an incomplete process of eradication of ALV from ALV-positive roosters led to the sporadic presence of ALV-J in laying hens.
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This work was supported by the National Natural Science Foundation Youth Fund (31802201).
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Meng, F., Li, Q., Han, R. et al. A study on the infection status and transmission of avian leukosis virus subgroup J in Hy-line brown roosters. Arch Virol 167, 1521–1527 (2022). https://doi.org/10.1007/s00705-022-05452-4
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DOI: https://doi.org/10.1007/s00705-022-05452-4