The results indicated that PCV-2 antigens were mainly found in the epithelioid macrophages of lymphoid nodule of pigs on PCV-2 group and PCV-2+KLH group.

• PCV-2组和PCV-2+KLH组仔猪淋巴结中的淋巴细胞凋亡严重，且主要是淋巴小结内的淋巴细胞发生凋亡，流式细胞仪检测PCV-2组和PCV-2+KLH组仔猪淋巴结中的细胞凋亡率分别为3.；34%25、4