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The proportion of CD3 and CD79a positive cells to total interlukin (IL)-10 positive cells in two lymphoid organs of porcine circovirus type 2 (PCV2)-infected pigs by double-labeling immunohistochemistry (DL-IHC)
+: IHC positive, -: IHC negative. *The expression of IL-10 in PCV2-infected tissues is significantly higher than that of control tissues (p<0.01).
