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Figure 3 | Veterinary Research

Figure 3

From: Alternate routes of influenza A virus infection in Mallard (Anas platyrhynchos)

Figure 3

Select tissues following immunohistochemical staining to detect nucleoprotein of influenza A. A The bursa of Fabricius, when present, did not show virus antigen expression. B Positive staining of surface epithelium on the tips of villi in the colon. This tissue was scored as a “3” as positive staining is “marked”. Viral antigen expression is inferred by red staining in the nucleus of surface epithelium. Tissues have been counterstained with hematoxylin and appear blue. Original magnification is 200×.

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