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Immunohistochemistry for detection of PCV2 antigens in lymph nodes. (A) PCV2 antigens (arrows) were detected at 21 dpc in granulomatous inflammations of lymph nodes from pigs which received the PRRSV vaccine followed by dual challenge (group 4). (B) PCV2 antigens (arrow) were occasionally detected at 21 dpc in macrophages of lymph nodes from pigs which were challenged with PCV2 (group 6).
