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Increased pulmonary clearance of Serratia marcescens in calves given intravenous Freund's complete adjuvant.

Lung and alveolar macrophage studies were conducted following experimental immunostimulation of calves with Freund's complete adjuvant (FCA). Intravenous administration of FCA to calves 35 days before aerosol exposure to serratia marcescens resulted in a 53.1% reduction in the 2-hour pulmonary mean percent retention of the organism when compared to control calves. FCA treatment increased alveolar macrophage concentration (cells/g lung) by 30.9%. Lymphoid and granulomatous responses were increased in the lungs of treated calves.