Keywords Infectious bronchitis virus;Mouse hepatitis virus;S1 protein;N protein;gene vaccine;attenuated Salmonella typhimurium;Immunobiological properties;

• 鸡传染性支气管炎病毒;小鼠肝炎病毒;S1蛋白;N蛋白;基因疫苗;减毒鼠伤寒沙门氏菌;免疫生物学;