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【简答题】
某鸡场，采用滴鼻点眼法对7日龄鸡接种新城疫F疫苗，以刺激机体免疫器官产出局部黏膜免疫。该免疫器官是( )A.骨髓 B.胸腺 C.法氏囊 D.扁桃体 E.哈德氏腺 某鸡场，3鸡羽毛蓬松，排水样幾便。剖检可见腿肌胸肌出血;此外还发现某免疫器官呈紫葡萄状。该免疫器官是( )A.骨髓 B.胸腺 C.法氏囊 D.扁桃体 E.哈德氏腺 某猪场，2月龄猪高热稽留。剖检病死猪可见回盲瓣口“纽扣状”溃疡。对同群发病猪活体进行病原学检测时应采集的免疫器官是( )A.骨髓 B.胸腺 C.法氏囊 D.扁桃体 E.哈德氏腺
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