Thermal injury and recovery of Salmonella typhimurium and its effect on enumeration procedures.

Applied Microbiology
C W Clark, Z J Ordal

Abstract

Exposure of Salmonella typhimurium 7136 to sublethal heating produced a temporary change in the tolerance of the organism to a particular stress medium. After sublethal heat treatment at 48 C for 30 min, greater than 90% of the viable population was unable to reproduce on Levine Eosin Methylene Blue Agar containing 2% NaCl. This sensitivity was dependent on the pH of the heating menstruum. In addition, the heated cells displayed a sensitivity to Brilliant Green Agar, Levine Eosin Methylene Blue Agar, Salmonella-Shigella Agar, and Desoxycholate Citrate Agar. Unheated cells displayed a sensitivity to Brilliant Green Agar, Salmonella-Shigella Agar, and Desoxycholate Citrate Agar. When the injured cells were placed in a suitable medium (Trypticase Soy Broth), they recovered and grew at a rate equal to that of normal cells. Recovery was also possible in Nutrient Broth, Lactose Broth, and Lauryl Tryptose Broth. Although recovery of the injured cell occurred in Tetrathionate Broth and Selenite F Broth, they were less than ideal growth media for the organism.

References

Nov 1, 1968·Applied Microbiology·C W ClarkZ J Ordal
Jul 1, 1968·Applied Microbiology·R B ReadJ T Peeler
Jan 1, 1966·Journal of Bacteriology·J J Iandolo, Z J Ordal
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Citations

Feb 1, 1979·Applied and Environmental Microbiology·K S Przybylski, L D Witter
Sep 1, 1984·Applied and Environmental Microbiology·D H Bueschkens, M E Stiles
Dec 1, 1972·Applied Microbiology·L L Miller, Z J Ordal
Feb 1, 1974·Applied Microbiology·M D PiersonG L Ades
Mar 1, 1978·Applied and Environmental Microbiology·J Y D'Aoust
Jan 1, 1971·Applied Microbiology·D L ScheusnerM L Speck
Dec 1, 1976·Applied and Environmental Microbiology·B S EmswilerS P Shoemaker
Jun 1, 1982·Applied and Environmental Microbiology·P C Feng, P A Hartman
Feb 1, 1971·Journal of Bacteriology·R I Tomlins, Z J Ordal
Mar 1, 1971·Journal of Bacteriology·M D PiersonZ J Ordal
Aug 1, 1978·Applied and Environmental Microbiology·F H Grau
Nov 1, 1980·Applied and Environmental Microbiology·L RestainoW M Hill
Apr 16, 1971·Biochemical and Biophysical Research Communications·M D Pierson, Z J Ordal

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