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Effect of COS conjugation on the viscera index and injection site in PCV2-vaccinated mice. At 42 dpi, heart, lung, liver or kidneys of the mice were immediately separated and viscera indexes for them were calculated (a), and the tibialis muscle tissues near injection sites were collected for pathological examination by hematoxylin and eosin (HE)-staining (b). Solid arrows represented the inflammatory cell infiltration. Magnification: 100×.
