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Journal of Bacteriology, September 2000, p. 5070-5075, Vol. 182, No. 18
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.

Recovery of Hydrogen Peroxide-Sensitive Culturable Cells of Vibrio vulnificus Gives the Appearance of Resuscitation from a Viable but Nonculturable State

Gregg Bogosian,* Noelle D. Aardema, Edward V. Bourneuf, Patricia J. L. Morris, and Julia P. O'Neil

Monsanto Company, Chesterfield, Missouri 63198

Received 15 March 2000/Accepted 19 June 2000

The viabilities of five strains of Vibrio vulnificus were evaluated during the storage of the organisms in sterile seawater at 5°C. The number of CFU was measured by plate count methods on rich media. The total cell numbers were determined by direct microscopic count methods. The titer of CFU declined logarithmically to undetectable levels over a period of 2 to 3 weeks, while the total cell numbers were unchanged. Midway through each study, higher culturable cell counts began to be observed on plates containing catalase or sodium pyruvate; during the latter stages of the study, the plate counts on such media were up to 1,000-fold higher than those on unsupplemented plates. Because autoclaving is known to generate hydrogen peroxide in rich media, and because catalase and sodium pyruvate are known to eliminate hydrogen peroxide, it appears that the conditions of the experiments led to the selection of a hydrogen peroxide-sensitive culturable cell subpopulation. At the time of the final stage of the decline in viability of each culture, hydrogen peroxide-sensitive cells were the only culturable cells present. Warming samples of the cultures to room temperature led to the growth of these residual culturable cells, utilizing nutrients provided by the nonculturable cells. The cells that grew recovered hydrogen peroxide resistance. When mixtures of culturable and nonculturable cells were diluted to the point where only nonculturable cells were present, or when the hydrogen peroxide-sensitive culturable cells had declined to undetectable levels, warming had no effect; no culturable cells were recovered. Warming has been reported to "resuscitate" nonculturable cells. Recognition of the existence of hydrogen peroxide-sensitive culturable cell populations, as well as their ability to grow to high levels in the warmed seawater microcosms, leads instead to the conclusion that while warming permits culturable cells to grow, it has no effect on nonculturable cells.

* Corresponding author. Mailing address: Monsanto BB3M, 700 Chesterfield Parkway, Chesterfield, MO 63198. Phone: (636) 737-6149. Fax: (636) 737-7002. E-mail: gregg.bogosian{at}monsanto.com.

Journal of Bacteriology, September 2000, p. 5070-5075, Vol. 182, No. 18
0021-9193/00/$04.00+0
Copyright © 2000, American Society for Microbiology. All rights reserved.


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