Evaluation of the protective efficacy of a commercial vaccine against different antigenic groups of H9N2 influenza viruses in chickens.

@article{Sun2012EvaluationOT,
  title={Evaluation of the protective efficacy of a commercial vaccine against different antigenic groups of H9N2 influenza viruses in chickens.},
  author={Yipeng Sun and Juan Pu and Lihong Fan and Honglei Sun and Jingjing Wang and Yi Zhang and Linqing Liu and Jinhua Liu},
  journal={Veterinary microbiology},
  year={2012},
  volume={156 1-2},
  pages={193-9}
}
Despite the long-term vaccination programs implemented in China, H9N2 avian influenza viruses (AIVs) continue to persist in chicken populations, even in vaccinated flocks. We previously demonstrated that H9N2 AIV isolated from chickens in China also underwent antigenic drift and evolved into distinct antigenic groups (C, D and E). To understand whether antigenic drift of viruses away from the vaccine strain partially contributed to the circulation of H9N2 AIV in China, we evaluated the… CONTINUE READING
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