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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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