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Appl Environ Microbiol. 1975 June; 29(6): 861-863
Copyright © 1975 American Society for Microbiology. All Rights Reserved.

Radiation Resistance of Spores of Some Clostridium perfringens Strains

Food Sciences Laboratory, U.S. Army Natick Laboratories, Natick, Massachusetts 01760

ABSTRACT

Clostridium perfringens spores (eight strains) were irradiated in a model system with ⁶⁰Co gamma rays at -30 C. The quantal response data were analyzed with extreme value statistics. It was found (at the 95% confidence level) that all eight strains followed the same rate of death and that this rate was probably (at the 95% level) not exponential. The statistics did not exclude, however, a normal, lognormal, Weibull, or related rate of spore kill. A more definitive study would be required to distinguish between the latter distributions.

¹ Present address: Cochise Pathology Consultants, Sierra Vista, Ariz. 85635.