6) Langerhans type multinuclear giant cells in granulomatous lesions in pulmonary lymph nodes and acid-fast bacteria in the cytoplasm(Zeihl - neelsen staining).
5) Caseous degeneration seen at mesenteric lymph nodes.
7) Granulomatous lesions composed of multinuclear giant cells and epitheolid cells around necrotic tissues in the lung.
8) Colonies of Mycobacterium bovis (cultured on Herold media at 37°C for 8 weeks).