Figure 7From: Comparative studies on the pathogenicity and tissue distribution of three virulence variants of classical swine fever virus, two field isolates and one vaccine strain, with special regard to immunohistochemical investigationsTonsil. Experiment III, PID 8. Positive immunohistochemical staining Tonsil. Experiment III, PID 8. Immunoreactivity to WH 303 monoclonal antibody as a cytoplasmic rim in the crypt-epithelial cells. EnVision™ +HP mouse system. Magnification 540×.Back to article page