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Porcine circovirus type 2 (PCV2) affected pigs. (A) The pigs showed severe wasting symptoms. (B) The lymph node showed lymphoid depletion with histiocytic infiltration in lymphoid follicles (H&E staining, scale bar=50 µm). (C) Many PCV2 antigens (brown diaminobenzidine reaction) within the cytoplasm of histiocytic cells were observed in the lymphoid follicles (immunohistochemisty, scale bar=50 µm).
