Figure 4From: Pathogenicity of highly pathogenic avian influenza H5N8 subtype for herring gulls (Larus argentatus): impact of homo- and heterosubtypic immunity on the outcome of infectionImmunohistochemical staining of AIV nucleoprotein antigen in lungs and brains collected from gulls representing groups A–C at 4 and 14 dpi. Example photomicrographs, objective 10x. Positive IHC reaction indicating the presence of AIV antigen is visible as dark-brown particles in the lungs from group A and B, 4 dpi, as well as in neuronal cells in brains from group A (4 dpi) and group C (14 dpi). Scale bar = 50 µm.Back to article page