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Infectious pancreatic necrosis virus antigens (red stain) in different tissues of Atlantic salmon at designated time points following oral or anal intubation (immunohistochemistry). (A) Posterior intestine, inactivated IPNV at 72 h post oral intubation. (B) Head kidney, inactivated IPNV at 72 h post anal intubation. Key: E = enterocytes; MØ = macrophages; MMØ = melanomacrophages. Magnification: 40×.
