Abstract
Chicken infectious anemia (CIA), caused by chicken anemia virus (CAV), is an important immunosuppressive disease that seriously threatens the global poultry industry. Here, we isolated and identified 30 new CAV strains from CAV-positive flocks. The VP1 genes of these strains were sequenced and analyzed at the nucleotide and amino acid levels and were found to have very similar nucleotide sequences (> 97% identity); however, they showed 93.9–100.0% sequence identity to the VP1 genes of 55 reference strains. Furthermore, alignment of the deduced amino acid sequences revealed some unique mutations. Phylogenetic analysis indicated the division of VP1 amino acid sequences into two groups (A and B) and four subgroups (A1, A2, A3 and A4). Interestingly, 22 of the newly isolated strains and some Asian reference strains belonged to the A1 group, whereas the remaining eight new isolates belonged to the A3 group. To evaluate the pathogenicity of the epidemic CAV strains from China, the representative strains CAV-JL16/8901 and CAV-HeN19/3001 and the reference strain Cux-1 were selected for animal experiments. Chickens infected with the isolates and reference strain all showed thymus atrophy and bone marrow yellowing. The mortality rates for CAV-JL16/8901, CAV-HeN19/3001, and the reference strain was 30%, 20%, and 0%, respectively, indicating that the epidemic strains pose a more serious threat to chickens. We not only analyzed the molecular evolution of the epidemic strains but also showed for the first time that the epidemic strains in China are more pathogenic than reference strain Cux-1. Effective measures should be established to prevent the spread of CIA in China.
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Acknowledgements
This study was supported by the National Key Research and Development Program of China [Grant number 2016YFE0203200] and the Earmarked Fund for Modern Agriculture Industry Technology Research System [Grant number CARS-41-G15].
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YL, NY, and YZ performed experiments. YL, YW, AL, XL, and BY assembled and analyzed the data and prepared the figures. YZ, YW, CL, and YG contributed to the experimental design and interpretation. HG provided reagents. XW, XQ, HC, KL, LG, and QP provided valuable suggestions. YL, YZ, and XW wrote the paper, and all other authors critically reviewed the manuscript.
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Li, Y., Yan, N., Wang, Y. et al. Molecular evolution and pathogenicity of chicken anemia virus isolates in China. Arch Virol 166, 439–449 (2021). https://doi.org/10.1007/s00705-020-04909-8
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DOI: https://doi.org/10.1007/s00705-020-04909-8