In the current stage, many countries choose to cull all infected poultry to control avian influenza, instead of immunizations. The total volume of the poultry in China is over 10 billion, but more than 90% raisers only have less than 2,000 broilers. In case of epidemic diseases, it is hard to control them, which will result in huge losses. Therefore, it is quite necessary to immunize the poultry with avian influenza vaccines. Avian influenza vaccines have been used for more than 10 years in China. More than 10 years ago, some poultry raising farms in China used the H5N1 avian …
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