Figure 8From: Distribution of sialic acid receptors and influenza A virus of avian and swine origin in experimentally infected pigsDouble immunohistochemical staining of avian influenza virus antigens and epithelial cells. Lung sections from avian influenza virus (AIV) infected pig, euthanized PID 4. Double immunohistochemical staining using polyclonal anti-influenza and anti-cytokeratin antibodies (counterstaining with hematoxylin) demonstrating AIV antigen positive cells (clear blue cells) and epithelial cells (clear red cells). Double positive cells (AIV antigen positive epithelial cells) are purple. A: Demonstration of double positive alveolar epithelial cells (arrowhead). B: Greater magnification than A, demonstration of double stained alveolar type II epithelial cell (arrowhead). (Original magnifications A: x10, B: x40).Back to article page