结论：异种血管内皮生长因子基因重组T7噬菌体疫苗可打破机体对自身vegf的免疫耐受，诱导产生较高水平的特异性抗vegf抗体。
Conclusion: Recombinant T7 phage vaccine expressing xenogenic VEGF can break immunologic tolerance against self-VEGF and induce the producing of specific anti-VEGF antibody.
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。
The protective efficacy of vaccines showed that the live attenuated vaccines only provided partial protection to the vaccinated chickens against heterologous IBV infection.
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