Fig. 5From: Localization and immunohistochemical detection of swine influenza A virus subtype H1N1 antigen in formalin-fixed, paraffin-embedded lung tissues from naturally infected pigsPhotomicrograph of lung sections of SIV-positive control showing a an intense granular brown immunohistochemical staining in the alveolar macrophages (arrowed), b negative control without immunohistochemical reaction. Streptavidin-peroxidase, DAB. Bar = 10 μm, d, e intense immunosignal in the bronchial submucosal glandular epithelial cells (arrowed). Streptavidin-peroxidase, DAB. Bar = 10 μm, and f less intense immunosignal was detected in the nuclei and cytoplasm of the bronchiolar epithelial cells (arrows). Streptavidin-peroxidase, DAB. Bar = 50 μmBack to article page