Effect of Mucosal Immunuization with Infectious Bronchitis Vaccine on the Distribution of SIgA Cells in the Trachea and Harderian Gland in Chickling

• 传染性支气管炎弱毒苗黏膜途径免疫对雏鸡气管及哈德氏腺SIgA细胞分布的影响