The Influence of Temperature on the Motility of Pasteurella pseudotuberculosis

Abstract

Strains of P. pseudotuberculosis were grown at 22[degree]C and at 37[degree]C. At the lower temp. the organisms were motile, and had antigen and flagella. At 37[degree] they were non-motile, showed no flagella, and contained no H antigen. The change took place around 30[degree], and was not due to pH, nor was there any evidence of a destructive enzyme. There was some indication that organisms grown at 22[degree]C were more virulent for mice than those grown at the higher temp. It appears that different metabolic processes are used at the 2 temps.