The protective efficacy of vaccines showed that the live attenuatedvaccines only provided partial protection to the vaccinated chickens against heterologous IBV infection.
我国目前使用的主要活疫苗对异种IBV分离株的感染不能提供完全的保护作用。
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The experts noted that a variety of pandemic vaccines, including live attenuated and both adjuvanted and non-adjuvanted inactivated vaccines, have now been licensed for use by regulatory authorities.
Most will be inactivated virus vaccines made in eggs, some will be killed virus vaccines made in cell cultures and a few will be live attenuated virus vaccines.