[Electron microscopic studies of mucosal extirpates of rabbits after after in vitro contact with Pasteurella multocida subsp. multocida strains].

In vitro experiments of adhesion and colonisation of mucosal surface fragments (nose, trachea) from freshly killed rabbits with four strains of Pasteurella multocida subsp. multocida with different types of capsule antigen (A, D, without capsule) showed the following results: Above all the capsule serovar A strain, producing a capsule of hyaluronic acid and fimbria, were able to adhere and to form microcolonies on the mucosal surface. Microvilli of epithelial cells and mucus producing cells were recognized as the place of adhesion. The formation of microcolonies occurred with a destruction of the kinocilia, which was caused by a bacteria free culture filtrate as well.