A Note on the Development of Resistance to Heat and Gamma Radiation in Salmonella

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Abstract
Summary.: Repeated heat treatment and subculture increased the heat resistance of one strain of Salmonella typhimurium with no apparent increase in pathogenicity, or significant change in common biochemical characters. Cycling to γ radiation produced similar results. Re‐cycled strains contained extremely low proportions of the smooth colonies required for serological and phage typing.