Infection of mice by the respiratory route with Salmonella typhimurium

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Abstract
Experiments have been described in which mice were infected by the inhalation of a mono-dispersed aerosol of Salm. typhimurium. The disease so produced was characterized by a specific primary pneumonia. The lethal dose was very much smaller than that required by ingestion, and was approximately equal to the intraperitoneal lethal dose. Possible implications have been discussed.The authors wish to thank Mr S. Peacock for his invaluable help in the operation of the Henderson apparatus, and Messrs A. V. Lowle and C. M. R. Pitman for technical assistance. We also wish to thank Dr J. S. Paterson for supplying some of the bacterial strains, and for much advice and encouragement.