[Experimental bedsonia infections in calf. 2. Pathomorphologic studies].

Tracheal inoculation of bovine strains of Bedsonia was often followed by inflammatory processes in lung, trachea, nasal mucosa and also spleen, lymph nodes and brain. Lesions in the duct system and alveoli of the lung consisted of exudates containing neutrophilic granulocytes and proliferation of epithelial and mesenchymal cells. The initial changes were evidently located in the bronchioli. Elementary bodies were present in variable numbers. The formation of lesions seemed to be influenced by route of infection and concentration of the causal organisms in the inoculum.